diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..8f61a8e
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+# SCM syntax highlighting
+pixi.lock linguist-language=YAML linguist-generated=true
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..740bb7d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+
+# pixi environments
+.pixi
+*.egg-info
diff --git a/pixi.lock b/pixi.lock
new file mode 100644
index 0000000..e01631d
--- /dev/null
+++ b/pixi.lock
@@ -0,0 +1,906 @@
+version: 6
+environments:
+  default:
+    channels:
+    - url: https://prefix.dev/conda-forge/
+    indexes:
+    - https://pypi.org/simple
+    packages:
+      linux-64:
+      - conda: https://prefix.dev/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
+      - conda: https://prefix.dev/conda-forge/linux-64/_openmp_mutex-4.5-2_gnu.tar.bz2
+      - conda: https://prefix.dev/conda-forge/linux-64/bzip2-1.0.8-h4bc722e_7.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/ca-certificates-2025.1.31-hbcca054_0.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/ld_impl_linux-64-2.43-h712a8e2_2.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/libexpat-2.6.4-h5888daf_0.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/libffi-3.4.2-h7f98852_5.tar.bz2
+      - conda: https://prefix.dev/conda-forge/linux-64/libgcc-14.2.0-h77fa898_1.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/libgcc-ng-14.2.0-h69a702a_1.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/libgomp-14.2.0-h77fa898_1.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/liblzma-5.6.4-hb9d3cd8_0.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/libmpdec-4.0.0-h4bc722e_0.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/libsqlite-3.48.0-hee588c1_1.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/libuuid-2.38.1-h0b41bf4_0.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/libzlib-1.3.1-hb9d3cd8_2.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/ncurses-6.5-h2d0b736_3.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/openssl-3.4.0-h7b32b05_1.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/optype-0.9.0-py313h78bf25f_0.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/python-3.13.1-ha99a958_105_cp313.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/python_abi-3.13-5_cp313.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/readline-8.2-h8228510_1.conda
+      - conda: https://prefix.dev/conda-forge/linux-64/tk-8.6.13-noxft_h4845f30_101.conda
+      - conda: https://prefix.dev/conda-forge/noarch/tzdata-2025a-h78e105d_0.conda
+      - pypi: .
+      osx-64:
+      - conda: https://prefix.dev/conda-forge/osx-64/bzip2-1.0.8-hfdf4475_7.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/ca-certificates-2025.1.31-h8857fd0_0.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/libexpat-2.6.4-h240833e_0.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/libffi-3.4.2-h0d85af4_5.tar.bz2
+      - conda: https://prefix.dev/conda-forge/osx-64/liblzma-5.6.4-hd471939_0.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/libmpdec-4.0.0-hfdf4475_0.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/libsqlite-3.48.0-hdb6dae5_1.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/libzlib-1.3.1-hd23fc13_2.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/ncurses-6.5-h0622a9a_3.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/openssl-3.4.0-hc426f3f_1.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/optype-0.9.0-py313habf4b1d_0.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/python-3.13.1-h2334245_105_cp313.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/python_abi-3.13-5_cp313.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/readline-8.2-h9e318b2_1.conda
+      - conda: https://prefix.dev/conda-forge/osx-64/tk-8.6.13-h1abcd95_1.conda
+      - conda: https://prefix.dev/conda-forge/noarch/tzdata-2025a-h78e105d_0.conda
+      - pypi: .
+      osx-arm64:
+      - conda: https://prefix.dev/conda-forge/osx-arm64/bzip2-1.0.8-h99b78c6_7.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/ca-certificates-2025.1.31-hf0a4a13_0.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/libexpat-2.6.4-h286801f_0.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/libffi-3.4.2-h3422bc3_5.tar.bz2
+      - conda: https://prefix.dev/conda-forge/osx-arm64/liblzma-5.6.4-h39f12f2_0.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/libmpdec-4.0.0-h99b78c6_0.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/libsqlite-3.48.0-h3f77e49_1.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/libzlib-1.3.1-h8359307_2.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/ncurses-6.5-h5e97a16_3.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/openssl-3.4.0-h81ee809_1.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/optype-0.9.0-py313h8f79df9_0.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/python-3.13.1-h4f43103_105_cp313.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/python_abi-3.13-5_cp313.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/readline-8.2-h92ec313_1.conda
+      - conda: https://prefix.dev/conda-forge/osx-arm64/tk-8.6.13-h5083fa2_1.conda
+      - conda: https://prefix.dev/conda-forge/noarch/tzdata-2025a-h78e105d_0.conda
+      - pypi: .
+      win-64:
+      - conda: https://prefix.dev/conda-forge/win-64/bzip2-1.0.8-h2466b09_7.conda
+      - conda: https://prefix.dev/conda-forge/win-64/ca-certificates-2025.1.31-h56e8100_0.conda
+      - conda: https://prefix.dev/conda-forge/win-64/libexpat-2.6.4-he0c23c2_0.conda
+      - conda: https://prefix.dev/conda-forge/win-64/libffi-3.4.2-h8ffe710_5.tar.bz2
+      - conda: https://prefix.dev/conda-forge/win-64/liblzma-5.6.4-h2466b09_0.conda
+      - conda: https://prefix.dev/conda-forge/win-64/libsqlite-3.48.0-h67fdade_1.conda
+      - conda: https://prefix.dev/conda-forge/win-64/libzlib-1.3.1-h2466b09_2.conda
+      - conda: https://prefix.dev/conda-forge/win-64/openssl-3.4.0-ha4e3fda_1.conda
+      - conda: https://prefix.dev/conda-forge/win-64/optype-0.9.0-py312h2e8e312_0.conda
+      - conda: https://prefix.dev/conda-forge/win-64/python-3.12.8-h3f84c4b_1_cpython.conda
+      - conda: https://prefix.dev/conda-forge/win-64/python_abi-3.12-5_cp312.conda
+      - conda: https://prefix.dev/conda-forge/win-64/tk-8.6.13-h5226925_1.conda
+      - conda: https://prefix.dev/conda-forge/noarch/typing-extensions-4.12.2-hd8ed1ab_1.conda
+      - conda: https://prefix.dev/conda-forge/noarch/typing_extensions-4.12.2-pyha770c72_1.conda
+      - conda: https://prefix.dev/conda-forge/noarch/tzdata-2025a-h78e105d_0.conda
+      - conda: https://prefix.dev/conda-forge/win-64/ucrt-10.0.22621.0-h57928b3_1.conda
+      - conda: https://prefix.dev/conda-forge/win-64/vc-14.3-h5fd82a7_24.conda
+      - conda: https://prefix.dev/conda-forge/win-64/vc14_runtime-14.42.34433-h6356254_24.conda
+      - conda: https://prefix.dev/conda-forge/win-64/vs2015_runtime-14.42.34433-hfef2bbc_24.conda
+      - pypi: .
+packages:
+- conda: https://prefix.dev/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
+  sha256: fe51de6107f9edc7aa4f786a70f4a883943bc9d39b3bb7307c04c41410990726
+  md5: d7c89558ba9fa0495403155b64376d81
+  license: None
+  purls: []
+  size: 2562
+  timestamp: 1578324546067
+- conda: https://prefix.dev/conda-forge/linux-64/_openmp_mutex-4.5-2_gnu.tar.bz2
+  build_number: 16
+  sha256: fbe2c5e56a653bebb982eda4876a9178aedfc2b545f25d0ce9c4c0b508253d22
+  md5: 73aaf86a425cc6e73fcf236a5a46396d
+  depends:
+  - _libgcc_mutex 0.1 conda_forge
+  - libgomp >=7.5.0
+  constrains:
+  - openmp_impl 9999
+  license: BSD-3-Clause
+  license_family: BSD
+  purls: []
+  size: 23621
+  timestamp: 1650670423406
+- conda: https://prefix.dev/conda-forge/linux-64/bzip2-1.0.8-h4bc722e_7.conda
+  sha256: 5ced96500d945fb286c9c838e54fa759aa04a7129c59800f0846b4335cee770d
+  md5: 62ee74e96c5ebb0af99386de58cf9553
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc-ng >=12
+  license: bzip2-1.0.6
+  license_family: BSD
+  purls: []
+  size: 252783
+  timestamp: 1720974456583
+- conda: https://prefix.dev/conda-forge/osx-64/bzip2-1.0.8-hfdf4475_7.conda
+  sha256: cad153608b81fb24fc8c509357daa9ae4e49dfc535b2cb49b91e23dbd68fc3c5
+  md5: 7ed4301d437b59045be7e051a0308211
+  depends:
+  - __osx >=10.13
+  license: bzip2-1.0.6
+  license_family: BSD
+  purls: []
+  size: 134188
+  timestamp: 1720974491916
+- conda: https://prefix.dev/conda-forge/osx-arm64/bzip2-1.0.8-h99b78c6_7.conda
+  sha256: adfa71f158cbd872a36394c56c3568e6034aa55c623634b37a4836bd036e6b91
+  md5: fc6948412dbbbe9a4c9ddbbcfe0a79ab
+  depends:
+  - __osx >=11.0
+  license: bzip2-1.0.6
+  license_family: BSD
+  purls: []
+  size: 122909
+  timestamp: 1720974522888
+- conda: https://prefix.dev/conda-forge/win-64/bzip2-1.0.8-h2466b09_7.conda
+  sha256: 35a5dad92e88fdd7fc405e864ec239486f4f31eec229e31686e61a140a8e573b
+  md5: 276e7ffe9ffe39688abc665ef0f45596
+  depends:
+  - ucrt >=10.0.20348.0
+  - vc >=14.2,<15
+  - vc14_runtime >=14.29.30139
+  license: bzip2-1.0.6
+  license_family: BSD
+  purls: []
+  size: 54927
+  timestamp: 1720974860185
+- conda: https://prefix.dev/conda-forge/linux-64/ca-certificates-2025.1.31-hbcca054_0.conda
+  sha256: bf832198976d559ab44d6cdb315642655547e26d826e34da67cbee6624cda189
+  md5: 19f3a56f68d2fd06c516076bff482c52
+  license: ISC
+  purls: []
+  size: 158144
+  timestamp: 1738298224464
+- conda: https://prefix.dev/conda-forge/osx-64/ca-certificates-2025.1.31-h8857fd0_0.conda
+  sha256: 42e911ee2d8808eacedbec46d99b03200a6138b8e8a120bd8acabe1cac41c63b
+  md5: 3418b6c8cac3e71c0bc089fc5ea53042
+  license: ISC
+  purls: []
+  size: 158408
+  timestamp: 1738298385933
+- conda: https://prefix.dev/conda-forge/osx-arm64/ca-certificates-2025.1.31-hf0a4a13_0.conda
+  sha256: 7e12816618173fe70f5c638b72adf4bfd4ddabf27794369bb17871c5bb75b9f9
+  md5: 3569d6a9141adc64d2fe4797f3289e06
+  license: ISC
+  purls: []
+  size: 158425
+  timestamp: 1738298167688
+- conda: https://prefix.dev/conda-forge/win-64/ca-certificates-2025.1.31-h56e8100_0.conda
+  sha256: 1bedccdf25a3bd782d6b0e57ddd97cdcda5501716009f2de4479a779221df155
+  md5: 5304a31607974dfc2110dfbb662ed092
+  license: ISC
+  purls: []
+  size: 158690
+  timestamp: 1738298232550
+- conda: https://prefix.dev/conda-forge/linux-64/ld_impl_linux-64-2.43-h712a8e2_2.conda
+  sha256: 7c91cea91b13f4314d125d1bedb9d03a29ebbd5080ccdea70260363424646dbe
+  md5: 048b02e3962f066da18efe3a21b77672
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  constrains:
+  - binutils_impl_linux-64 2.43
+  license: GPL-3.0-only
+  license_family: GPL
+  purls: []
+  size: 669211
+  timestamp: 1729655358674
+- conda: https://prefix.dev/conda-forge/linux-64/libexpat-2.6.4-h5888daf_0.conda
+  sha256: 56541b98447b58e52d824bd59d6382d609e11de1f8adf20b23143e353d2b8d26
+  md5: db833e03127376d461e1e13e76f09b6c
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=13
+  constrains:
+  - expat 2.6.4.*
+  license: MIT
+  license_family: MIT
+  purls: []
+  size: 73304
+  timestamp: 1730967041968
+- conda: https://prefix.dev/conda-forge/osx-64/libexpat-2.6.4-h240833e_0.conda
+  sha256: d10f43d0c5df6c8cf55259bce0fe14d2377eed625956cddce06f58827d288c59
+  md5: 20307f4049a735a78a29073be1be2626
+  depends:
+  - __osx >=10.13
+  constrains:
+  - expat 2.6.4.*
+  license: MIT
+  license_family: MIT
+  purls: []
+  size: 70758
+  timestamp: 1730967204736
+- conda: https://prefix.dev/conda-forge/osx-arm64/libexpat-2.6.4-h286801f_0.conda
+  sha256: e42ab5ace927ee7c84e3f0f7d813671e1cf3529f5f06ee5899606630498c2745
+  md5: 38d2656dd914feb0cab8c629370768bf
+  depends:
+  - __osx >=11.0
+  constrains:
+  - expat 2.6.4.*
+  license: MIT
+  license_family: MIT
+  purls: []
+  size: 64693
+  timestamp: 1730967175868
+- conda: https://prefix.dev/conda-forge/win-64/libexpat-2.6.4-he0c23c2_0.conda
+  sha256: 0c0447bf20d1013d5603499de93a16b6faa92d7ead870d96305c0f065b6a5a12
+  md5: eb383771c680aa792feb529eaf9df82f
+  depends:
+  - ucrt >=10.0.20348.0
+  - vc >=14.2,<15
+  - vc14_runtime >=14.29.30139
+  constrains:
+  - expat 2.6.4.*
+  license: MIT
+  license_family: MIT
+  purls: []
+  size: 139068
+  timestamp: 1730967442102
+- conda: https://prefix.dev/conda-forge/linux-64/libffi-3.4.2-h7f98852_5.tar.bz2
+  sha256: ab6e9856c21709b7b517e940ae7028ae0737546122f83c2aa5d692860c3b149e
+  md5: d645c6d2ac96843a2bfaccd2d62b3ac3
+  depends:
+  - libgcc-ng >=9.4.0
+  license: MIT
+  license_family: MIT
+  purls: []
+  size: 58292
+  timestamp: 1636488182923
+- conda: https://prefix.dev/conda-forge/osx-64/libffi-3.4.2-h0d85af4_5.tar.bz2
+  sha256: 7a2d27a936ceee6942ea4d397f9c7d136f12549d86f7617e8b6bad51e01a941f
+  md5: ccb34fb14960ad8b125962d3d79b31a9
+  license: MIT
+  license_family: MIT
+  purls: []
+  size: 51348
+  timestamp: 1636488394370
+- conda: https://prefix.dev/conda-forge/osx-arm64/libffi-3.4.2-h3422bc3_5.tar.bz2
+  sha256: 41b3d13efb775e340e4dba549ab5c029611ea6918703096b2eaa9c015c0750ca
+  md5: 086914b672be056eb70fd4285b6783b6
+  license: MIT
+  license_family: MIT
+  purls: []
+  size: 39020
+  timestamp: 1636488587153
+- conda: https://prefix.dev/conda-forge/win-64/libffi-3.4.2-h8ffe710_5.tar.bz2
+  sha256: 1951ab740f80660e9bc07d2ed3aefb874d78c107264fd810f24a1a6211d4b1a5
+  md5: 2c96d1b6915b408893f9472569dee135
+  depends:
+  - vc >=14.1,<15.0a0
+  - vs2015_runtime >=14.16.27012
+  license: MIT
+  license_family: MIT
+  purls: []
+  size: 42063
+  timestamp: 1636489106777
+- conda: https://prefix.dev/conda-forge/linux-64/libgcc-14.2.0-h77fa898_1.conda
+  sha256: 53eb8a79365e58849e7b1a068d31f4f9e718dc938d6f2c03e960345739a03569
+  md5: 3cb76c3f10d3bc7f1105b2fc9db984df
+  depends:
+  - _libgcc_mutex 0.1 conda_forge
+  - _openmp_mutex >=4.5
+  constrains:
+  - libgomp 14.2.0 h77fa898_1
+  - libgcc-ng ==14.2.0=*_1
+  license: GPL-3.0-only WITH GCC-exception-3.1
+  license_family: GPL
+  purls: []
+  size: 848745
+  timestamp: 1729027721139
+- conda: https://prefix.dev/conda-forge/linux-64/libgcc-ng-14.2.0-h69a702a_1.conda
+  sha256: 3a76969c80e9af8b6e7a55090088bc41da4cffcde9e2c71b17f44d37b7cb87f7
+  md5: e39480b9ca41323497b05492a63bc35b
+  depends:
+  - libgcc 14.2.0 h77fa898_1
+  license: GPL-3.0-only WITH GCC-exception-3.1
+  license_family: GPL
+  purls: []
+  size: 54142
+  timestamp: 1729027726517
+- conda: https://prefix.dev/conda-forge/linux-64/libgomp-14.2.0-h77fa898_1.conda
+  sha256: 1911c29975ec99b6b906904040c855772ccb265a1c79d5d75c8ceec4ed89cd63
+  md5: cc3573974587f12dda90d96e3e55a702
+  depends:
+  - _libgcc_mutex 0.1 conda_forge
+  license: GPL-3.0-only WITH GCC-exception-3.1
+  license_family: GPL
+  purls: []
+  size: 460992
+  timestamp: 1729027639220
+- conda: https://prefix.dev/conda-forge/linux-64/liblzma-5.6.4-hb9d3cd8_0.conda
+  sha256: cad52e10319ca4585bc37f0bc7cce99ec7c15dc9168e42ccb96b741b0a27db3f
+  md5: 42d5b6a0f30d3c10cd88cb8584fda1cb
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=13
+  license: 0BSD
+  purls: []
+  size: 111357
+  timestamp: 1738525339684
+- conda: https://prefix.dev/conda-forge/osx-64/liblzma-5.6.4-hd471939_0.conda
+  sha256: a895b5b16468a6ed436f022d72ee52a657f9b58214b91fabfab6230e3592a6dd
+  md5: db9d7b0152613f097cdb61ccf9f70ef5
+  depends:
+  - __osx >=10.13
+  license: 0BSD
+  purls: []
+  size: 103749
+  timestamp: 1738525448522
+- conda: https://prefix.dev/conda-forge/osx-arm64/liblzma-5.6.4-h39f12f2_0.conda
+  sha256: 560c59d3834cc652a84fb45531bd335ad06e271b34ebc216e380a89798fe8e2c
+  md5: e3fd1f8320a100f2b210e690a57cd615
+  depends:
+  - __osx >=11.0
+  license: 0BSD
+  purls: []
+  size: 98945
+  timestamp: 1738525462560
+- conda: https://prefix.dev/conda-forge/win-64/liblzma-5.6.4-h2466b09_0.conda
+  sha256: 3f552b0bdefdd1459ffc827ea3bf70a6a6920c7879d22b6bfd0d73015b55227b
+  md5: c48f6ad0ef0a555b27b233dfcab46a90
+  depends:
+  - ucrt >=10.0.20348.0
+  - vc >=14.2,<15
+  - vc14_runtime >=14.29.30139
+  license: 0BSD
+  purls: []
+  size: 104465
+  timestamp: 1738525557254
+- conda: https://prefix.dev/conda-forge/linux-64/libmpdec-4.0.0-h4bc722e_0.conda
+  sha256: d02d1d3304ecaf5c728e515eb7416517a0b118200cd5eacbe829c432d1664070
+  md5: aeb98fdeb2e8f25d43ef71fbacbeec80
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc-ng >=12
+  license: BSD-2-Clause
+  license_family: BSD
+  purls: []
+  size: 89991
+  timestamp: 1723817448345
+- conda: https://prefix.dev/conda-forge/osx-64/libmpdec-4.0.0-hfdf4475_0.conda
+  sha256: 791be3d30d8e37ec49bcc23eb8f1e1415d911a7c023fa93685f2ea485179e258
+  md5: ed625b2e59dff82859c23dd24774156b
+  depends:
+  - __osx >=10.13
+  license: BSD-2-Clause
+  license_family: BSD
+  purls: []
+  size: 76561
+  timestamp: 1723817691512
+- conda: https://prefix.dev/conda-forge/osx-arm64/libmpdec-4.0.0-h99b78c6_0.conda
+  sha256: f7917de9117d3a5fe12a39e185c7ce424f8d5010a6f97b4333e8a1dcb2889d16
+  md5: 7476305c35dd9acef48da8f754eedb40
+  depends:
+  - __osx >=11.0
+  license: BSD-2-Clause
+  license_family: BSD
+  purls: []
+  size: 69263
+  timestamp: 1723817629767
+- conda: https://prefix.dev/conda-forge/linux-64/libsqlite-3.48.0-hee588c1_1.conda
+  sha256: 22853d289ef6ec8a5b20f1aa261895b06525439990d3b139f8bfd0b5c5e32a3a
+  md5: 3fa05c528d8a1e2a67bbf1e36f22d3bc
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=13
+  - libzlib >=1.3.1,<2.0a0
+  license: Unlicense
+  purls: []
+  size: 878223
+  timestamp: 1737564987837
+- conda: https://prefix.dev/conda-forge/osx-64/libsqlite-3.48.0-hdb6dae5_1.conda
+  sha256: ccff3309ed7b1561d3bb00f1e4f36d9d1323af998013e3182a13bf0b5dcef4ec
+  md5: 6c4d367a4916ea169d614590bdf33b7c
+  depends:
+  - __osx >=10.13
+  - libzlib >=1.3.1,<2.0a0
+  license: Unlicense
+  purls: []
+  size: 926014
+  timestamp: 1737565233282
+- conda: https://prefix.dev/conda-forge/osx-arm64/libsqlite-3.48.0-h3f77e49_1.conda
+  sha256: 17c06940cc2a13fd6a17effabd6881b1477db38b2cd3ee2571092d293d3fdd75
+  md5: 4c55169502ecddf8077973a987d08f08
+  depends:
+  - __osx >=11.0
+  - libzlib >=1.3.1,<2.0a0
+  license: Unlicense
+  purls: []
+  size: 852831
+  timestamp: 1737564996616
+- conda: https://prefix.dev/conda-forge/win-64/libsqlite-3.48.0-h67fdade_1.conda
+  sha256: eb889b9ea754d30268fa740f91e62fae6c30ca40f9769051dd42390d2470a7ff
+  md5: 5a7a8f7f68ce1bdb7b58219786436f30
+  depends:
+  - ucrt >=10.0.20348.0
+  - vc >=14.2,<15
+  - vc14_runtime >=14.29.30139
+  license: Unlicense
+  purls: []
+  size: 897026
+  timestamp: 1737565547561
+- conda: https://prefix.dev/conda-forge/linux-64/libuuid-2.38.1-h0b41bf4_0.conda
+  sha256: 787eb542f055a2b3de553614b25f09eefb0a0931b0c87dbcce6efdfd92f04f18
+  md5: 40b61aab5c7ba9ff276c41cfffe6b80b
+  depends:
+  - libgcc-ng >=12
+  license: BSD-3-Clause
+  license_family: BSD
+  purls: []
+  size: 33601
+  timestamp: 1680112270483
+- conda: https://prefix.dev/conda-forge/linux-64/libzlib-1.3.1-hb9d3cd8_2.conda
+  sha256: d4bfe88d7cb447768e31650f06257995601f89076080e76df55e3112d4e47dc4
+  md5: edb0dca6bc32e4f4789199455a1dbeb8
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=13
+  constrains:
+  - zlib 1.3.1 *_2
+  license: Zlib
+  license_family: Other
+  purls: []
+  size: 60963
+  timestamp: 1727963148474
+- conda: https://prefix.dev/conda-forge/osx-64/libzlib-1.3.1-hd23fc13_2.conda
+  sha256: 8412f96504fc5993a63edf1e211d042a1fd5b1d51dedec755d2058948fcced09
+  md5: 003a54a4e32b02f7355b50a837e699da
+  depends:
+  - __osx >=10.13
+  constrains:
+  - zlib 1.3.1 *_2
+  license: Zlib
+  license_family: Other
+  purls: []
+  size: 57133
+  timestamp: 1727963183990
+- conda: https://prefix.dev/conda-forge/osx-arm64/libzlib-1.3.1-h8359307_2.conda
+  sha256: ce34669eadaba351cd54910743e6a2261b67009624dbc7daeeafdef93616711b
+  md5: 369964e85dc26bfe78f41399b366c435
+  depends:
+  - __osx >=11.0
+  constrains:
+  - zlib 1.3.1 *_2
+  license: Zlib
+  license_family: Other
+  purls: []
+  size: 46438
+  timestamp: 1727963202283
+- conda: https://prefix.dev/conda-forge/win-64/libzlib-1.3.1-h2466b09_2.conda
+  sha256: ba945c6493449bed0e6e29883c4943817f7c79cbff52b83360f7b341277c6402
+  md5: 41fbfac52c601159df6c01f875de31b9
+  depends:
+  - ucrt >=10.0.20348.0
+  - vc >=14.2,<15
+  - vc14_runtime >=14.29.30139
+  constrains:
+  - zlib 1.3.1 *_2
+  license: Zlib
+  license_family: Other
+  purls: []
+  size: 55476
+  timestamp: 1727963768015
+- conda: https://prefix.dev/conda-forge/linux-64/ncurses-6.5-h2d0b736_3.conda
+  sha256: 3fde293232fa3fca98635e1167de6b7c7fda83caf24b9d6c91ec9eefb4f4d586
+  md5: 47e340acb35de30501a76c7c799c41d7
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=13
+  license: X11 AND BSD-3-Clause
+  purls: []
+  size: 891641
+  timestamp: 1738195959188
+- conda: https://prefix.dev/conda-forge/osx-64/ncurses-6.5-h0622a9a_3.conda
+  sha256: ea4a5d27ded18443749aefa49dc79f6356da8506d508b5296f60b8d51e0c4bd9
+  md5: ced34dd9929f491ca6dab6a2927aff25
+  depends:
+  - __osx >=10.13
+  license: X11 AND BSD-3-Clause
+  purls: []
+  size: 822259
+  timestamp: 1738196181298
+- conda: https://prefix.dev/conda-forge/osx-arm64/ncurses-6.5-h5e97a16_3.conda
+  sha256: 2827ada40e8d9ca69a153a45f7fd14f32b2ead7045d3bbb5d10964898fe65733
+  md5: 068d497125e4bf8a66bf707254fff5ae
+  depends:
+  - __osx >=11.0
+  license: X11 AND BSD-3-Clause
+  purls: []
+  size: 797030
+  timestamp: 1738196177597
+- conda: https://prefix.dev/conda-forge/linux-64/openssl-3.4.0-h7b32b05_1.conda
+  sha256: f62f6bca4a33ca5109b6d571b052a394d836956d21b25b7ffd03376abf7a481f
+  md5: 4ce6875f75469b2757a65e10a5d05e31
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - ca-certificates
+  - libgcc >=13
+  license: Apache-2.0
+  license_family: Apache
+  purls: []
+  size: 2937158
+  timestamp: 1736086387286
+- conda: https://prefix.dev/conda-forge/osx-64/openssl-3.4.0-hc426f3f_1.conda
+  sha256: 879a960d586cf8a64131ac0c060ef575cfb8aa9f6813093cba92042a86ee867c
+  md5: eaae23dbfc9ec84775097898526c72ea
+  depends:
+  - __osx >=10.13
+  - ca-certificates
+  license: Apache-2.0
+  license_family: Apache
+  purls: []
+  size: 2590210
+  timestamp: 1736086530077
+- conda: https://prefix.dev/conda-forge/osx-arm64/openssl-3.4.0-h81ee809_1.conda
+  sha256: 97772762abc70b3a537683ca9fc3ff3d6099eb64e4aba3b9c99e6fce48422d21
+  md5: 22f971393637480bda8c679f374d8861
+  depends:
+  - __osx >=11.0
+  - ca-certificates
+  license: Apache-2.0
+  license_family: Apache
+  purls: []
+  size: 2936415
+  timestamp: 1736086108693
+- conda: https://prefix.dev/conda-forge/win-64/openssl-3.4.0-ha4e3fda_1.conda
+  sha256: 519a06eaab7c878fbebb8cab98ea4a4465eafb1e9ed8c6ce67226068a80a92f0
+  md5: fb45308ba8bfe1abf1f4a27bad24a743
+  depends:
+  - ca-certificates
+  - ucrt >=10.0.20348.0
+  - vc >=14.2,<15
+  - vc14_runtime >=14.29.30139
+  license: Apache-2.0
+  license_family: Apache
+  purls: []
+  size: 8462960
+  timestamp: 1736088436984
+- conda: https://prefix.dev/conda-forge/linux-64/optype-0.9.0-py313h78bf25f_0.conda
+  sha256: 58203b01ceddbd26323b83f7ce38e74c927bb7b327b429238727fd9c6052761e
+  md5: 3619861edc4e09ebb3555cec5e69b973
+  depends:
+  - python >=3.13,<3.14.0a0
+  - python_abi 3.13.* *_cp313
+  license: BSD-3-Clause
+  license_family: BSD
+  purls:
+  - pkg:pypi/optype?source=hash-mapping
+  size: 143573
+  timestamp: 1737487653387
+- conda: https://prefix.dev/conda-forge/osx-64/optype-0.9.0-py313habf4b1d_0.conda
+  sha256: dd0cf72c470e0be29db4c6c28da153de22fe7fa243e012894be7339cefa49170
+  md5: 8cfd505e53b8f1b518b377f82bf48ab6
+  depends:
+  - python >=3.13,<3.14.0a0
+  - python_abi 3.13.* *_cp313
+  license: BSD-3-Clause
+  license_family: BSD
+  purls:
+  - pkg:pypi/optype?source=hash-mapping
+  size: 144541
+  timestamp: 1737487717320
+- conda: https://prefix.dev/conda-forge/osx-arm64/optype-0.9.0-py313h8f79df9_0.conda
+  sha256: c8332ea33c5bf64d24bd0ce1e14a7e6213e088c651c364b49d7966ce6f264f80
+  md5: b902a6aa7c656b83df80e80bbb36da30
+  depends:
+  - python >=3.13,<3.14.0a0
+  - python >=3.13,<3.14.0a0 *_cp313
+  - python_abi 3.13.* *_cp313
+  license: BSD-3-Clause
+  license_family: BSD
+  purls:
+  - pkg:pypi/optype?source=hash-mapping
+  size: 144302
+  timestamp: 1737487721752
+- conda: https://prefix.dev/conda-forge/win-64/optype-0.9.0-py312h2e8e312_0.conda
+  sha256: 05d0124013bfdc1d575e9f0dde5c223c4eab09bf289c5d79892e24dce2799d3d
+  md5: 09672f40d77f551e9f5bb2d5c44c6e1a
+  depends:
+  - python >=3.12,<3.13.0a0
+  - python_abi 3.12.* *_cp312
+  - typing-extensions >=4.10
+  license: BSD-3-Clause
+  license_family: BSD
+  purls:
+  - pkg:pypi/optype?source=hash-mapping
+  size: 141813
+  timestamp: 1737487722666
+- conda: https://prefix.dev/conda-forge/linux-64/python-3.13.1-ha99a958_105_cp313.conda
+  build_number: 105
+  sha256: d3eb7d0820cf0189103bba1e60e242ffc15fd2f727640ac3a10394b27adf3cca
+  md5: 34945787453ee52a8f8271c1d19af1e8
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - bzip2 >=1.0.8,<2.0a0
+  - ld_impl_linux-64 >=2.36.1
+  - libexpat >=2.6.4,<3.0a0
+  - libffi >=3.4,<4.0a0
+  - libgcc >=13
+  - liblzma >=5.6.3,<6.0a0
+  - libmpdec >=4.0.0,<5.0a0
+  - libsqlite >=3.47.2,<4.0a0
+  - libuuid >=2.38.1,<3.0a0
+  - libzlib >=1.3.1,<2.0a0
+  - ncurses >=6.5,<7.0a0
+  - openssl >=3.4.0,<4.0a0
+  - python_abi 3.13.* *_cp313
+  - readline >=8.2,<9.0a0
+  - tk >=8.6.13,<8.7.0a0
+  - tzdata
+  license: Python-2.0
+  purls: []
+  size: 33169840
+  timestamp: 1736763984540
+- conda: https://prefix.dev/conda-forge/osx-64/python-3.13.1-h2334245_105_cp313.conda
+  build_number: 105
+  sha256: a9d224fa69c8b58c8112997f03988de569504c36ba619a08144c47512219e5ad
+  md5: c3318c58d14fefd755852e989c991556
+  depends:
+  - __osx >=10.13
+  - bzip2 >=1.0.8,<2.0a0
+  - libexpat >=2.6.4,<3.0a0
+  - libffi >=3.4,<4.0a0
+  - liblzma >=5.6.3,<6.0a0
+  - libmpdec >=4.0.0,<5.0a0
+  - libsqlite >=3.47.2,<4.0a0
+  - libzlib >=1.3.1,<2.0a0
+  - ncurses >=6.5,<7.0a0
+  - openssl >=3.4.0,<4.0a0
+  - python_abi 3.13.* *_cp313
+  - readline >=8.2,<9.0a0
+  - tk >=8.6.13,<8.7.0a0
+  - tzdata
+  license: Python-2.0
+  purls: []
+  size: 13893157
+  timestamp: 1736762934457
+- conda: https://prefix.dev/conda-forge/osx-arm64/python-3.13.1-h4f43103_105_cp313.conda
+  build_number: 105
+  sha256: 7d27cc8ef214abbdf7dd8a5d473e744f4bd9beb7293214a73c58e4895c2830b8
+  md5: 11d916b508764b7d881dd5c75d222d6e
+  depends:
+  - __osx >=11.0
+  - bzip2 >=1.0.8,<2.0a0
+  - libexpat >=2.6.4,<3.0a0
+  - libffi >=3.4,<4.0a0
+  - liblzma >=5.6.3,<6.0a0
+  - libmpdec >=4.0.0,<5.0a0
+  - libsqlite >=3.47.2,<4.0a0
+  - libzlib >=1.3.1,<2.0a0
+  - ncurses >=6.5,<7.0a0
+  - openssl >=3.4.0,<4.0a0
+  - python_abi 3.13.* *_cp313
+  - readline >=8.2,<9.0a0
+  - tk >=8.6.13,<8.7.0a0
+  - tzdata
+  license: Python-2.0
+  purls: []
+  size: 12919840
+  timestamp: 1736761931666
+- conda: https://prefix.dev/conda-forge/win-64/python-3.12.8-h3f84c4b_1_cpython.conda
+  build_number: 1
+  sha256: e1b37a398b3e2ea363de7cff6706e5ec2a5eb36b211132150e8601d7afd8f3aa
+  md5: 8cd0693344796fb32087185fca16f4cc
+  depends:
+  - bzip2 >=1.0.8,<2.0a0
+  - libexpat >=2.6.4,<3.0a0
+  - libffi >=3.4,<4.0a0
+  - liblzma >=5.6.3,<6.0a0
+  - libsqlite >=3.47.0,<4.0a0
+  - libzlib >=1.3.1,<2.0a0
+  - openssl >=3.4.0,<4.0a0
+  - tk >=8.6.13,<8.7.0a0
+  - tzdata
+  - ucrt >=10.0.20348.0
+  - vc >=14.2,<15
+  - vc14_runtime >=14.29.30139
+  constrains:
+  - python_abi 3.12.* *_cp312
+  license: Python-2.0
+  purls: []
+  size: 15812363
+  timestamp: 1733408080064
+- conda: https://prefix.dev/conda-forge/linux-64/python_abi-3.13-5_cp313.conda
+  build_number: 5
+  sha256: 438225b241c5f9bddae6f0178a97f5870a89ecf927dfca54753e689907331442
+  md5: 381bbd2a92c863f640a55b6ff3c35161
+  constrains:
+  - python 3.13.* *_cp313
+  license: BSD-3-Clause
+  license_family: BSD
+  purls: []
+  size: 6217
+  timestamp: 1723823393322
+- conda: https://prefix.dev/conda-forge/osx-64/python_abi-3.13-5_cp313.conda
+  build_number: 5
+  sha256: 075ad768648e88b78d2a94099563b43d3082e7c35979f457164f26d1079b7b5c
+  md5: 927a2186f1f997ac018d67c4eece90a6
+  constrains:
+  - python 3.13.* *_cp313
+  license: BSD-3-Clause
+  license_family: BSD
+  purls: []
+  size: 6291
+  timestamp: 1723823083064
+- conda: https://prefix.dev/conda-forge/osx-arm64/python_abi-3.13-5_cp313.conda
+  build_number: 5
+  sha256: 4437198eae80310f40b23ae2f8a9e0a7e5c2b9ae411a8621eb03d87273666199
+  md5: b8e82d0a5c1664638f87f63cc5d241fb
+  constrains:
+  - python 3.13.* *_cp313
+  license: BSD-3-Clause
+  license_family: BSD
+  purls: []
+  size: 6322
+  timestamp: 1723823058879
+- conda: https://prefix.dev/conda-forge/win-64/python_abi-3.12-5_cp312.conda
+  build_number: 5
+  sha256: 9486662af81a219e96d343449eff242f38d7c5128ced5ce5acf85857265058d6
+  md5: e8681f534453af7afab4cd2bc1423eec
+  constrains:
+  - python 3.12.* *_cpython
+  license: BSD-3-Clause
+  license_family: BSD
+  purls: []
+  size: 6730
+  timestamp: 1723823139725
+- pypi: .
+  name: quantity-api
+  version: 0.0.1.dev0
+  sha256: ae417f6dbe34163f2c926b8e183629ab735e0667155dca1240bcf1f558bd92ea
+  requires_python: '>=3.12'
+  editable: true
+- conda: https://prefix.dev/conda-forge/linux-64/readline-8.2-h8228510_1.conda
+  sha256: 5435cf39d039387fbdc977b0a762357ea909a7694d9528ab40f005e9208744d7
+  md5: 47d31b792659ce70f470b5c82fdfb7a4
+  depends:
+  - libgcc-ng >=12
+  - ncurses >=6.3,<7.0a0
+  license: GPL-3.0-only
+  license_family: GPL
+  purls: []
+  size: 281456
+  timestamp: 1679532220005
+- conda: https://prefix.dev/conda-forge/osx-64/readline-8.2-h9e318b2_1.conda
+  sha256: 41e7d30a097d9b060037f0c6a2b1d4c4ae7e942c06c943d23f9d481548478568
+  md5: f17f77f2acf4d344734bda76829ce14e
+  depends:
+  - ncurses >=6.3,<7.0a0
+  license: GPL-3.0-only
+  license_family: GPL
+  purls: []
+  size: 255870
+  timestamp: 1679532707590
+- conda: https://prefix.dev/conda-forge/osx-arm64/readline-8.2-h92ec313_1.conda
+  sha256: a1dfa679ac3f6007362386576a704ad2d0d7a02e98f5d0b115f207a2da63e884
+  md5: 8cbb776a2f641b943d413b3e19df71f4
+  depends:
+  - ncurses >=6.3,<7.0a0
+  license: GPL-3.0-only
+  license_family: GPL
+  purls: []
+  size: 250351
+  timestamp: 1679532511311
+- conda: https://prefix.dev/conda-forge/linux-64/tk-8.6.13-noxft_h4845f30_101.conda
+  sha256: e0569c9caa68bf476bead1bed3d79650bb080b532c64a4af7d8ca286c08dea4e
+  md5: d453b98d9c83e71da0741bb0ff4d76bc
+  depends:
+  - libgcc-ng >=12
+  - libzlib >=1.2.13,<2.0.0a0
+  license: TCL
+  license_family: BSD
+  purls: []
+  size: 3318875
+  timestamp: 1699202167581
+- conda: https://prefix.dev/conda-forge/osx-64/tk-8.6.13-h1abcd95_1.conda
+  sha256: 30412b2e9de4ff82d8c2a7e5d06a15f4f4fef1809a72138b6ccb53a33b26faf5
+  md5: bf830ba5afc507c6232d4ef0fb1a882d
+  depends:
+  - libzlib >=1.2.13,<2.0.0a0
+  license: TCL
+  license_family: BSD
+  purls: []
+  size: 3270220
+  timestamp: 1699202389792
+- conda: https://prefix.dev/conda-forge/osx-arm64/tk-8.6.13-h5083fa2_1.conda
+  sha256: 72457ad031b4c048e5891f3f6cb27a53cb479db68a52d965f796910e71a403a8
+  md5: b50a57ba89c32b62428b71a875291c9b
+  depends:
+  - libzlib >=1.2.13,<2.0.0a0
+  license: TCL
+  license_family: BSD
+  purls: []
+  size: 3145523
+  timestamp: 1699202432999
+- conda: https://prefix.dev/conda-forge/win-64/tk-8.6.13-h5226925_1.conda
+  sha256: 2c4e914f521ccb2718946645108c9bd3fc3216ba69aea20c2c3cedbd8db32bb1
+  md5: fc048363eb8f03cd1737600a5d08aafe
+  depends:
+  - ucrt >=10.0.20348.0
+  - vc >=14.2,<15
+  - vc14_runtime >=14.29.30139
+  license: TCL
+  license_family: BSD
+  purls: []
+  size: 3503410
+  timestamp: 1699202577803
+- conda: https://prefix.dev/conda-forge/noarch/typing-extensions-4.12.2-hd8ed1ab_1.conda
+  noarch: python
+  sha256: c8e9c1c467b5f960b627d7adc1c65fece8e929a3de89967e91ef0f726422fd32
+  md5: b6a408c64b78ec7b779a3e5c7a902433
+  depends:
+  - typing_extensions 4.12.2 pyha770c72_1
+  license: PSF-2.0
+  license_family: PSF
+  purls: []
+  size: 10075
+  timestamp: 1733188758872
+- conda: https://prefix.dev/conda-forge/noarch/typing_extensions-4.12.2-pyha770c72_1.conda
+  sha256: 337be7af5af8b2817f115b3b68870208b30c31d3439bec07bfb2d8f4823e3568
+  md5: d17f13df8b65464ca316cbc000a3cb64
+  depends:
+  - python >=3.9
+  license: PSF-2.0
+  license_family: PSF
+  purls:
+  - pkg:pypi/typing-extensions?source=hash-mapping
+  size: 39637
+  timestamp: 1733188758212
+- conda: https://prefix.dev/conda-forge/noarch/tzdata-2025a-h78e105d_0.conda
+  sha256: c4b1ae8a2931fe9b274c44af29c5475a85b37693999f8c792dad0f8c6734b1de
+  md5: dbcace4706afdfb7eb891f7b37d07c04
+  license: LicenseRef-Public-Domain
+  purls: []
+  size: 122921
+  timestamp: 1737119101255
+- conda: https://prefix.dev/conda-forge/win-64/ucrt-10.0.22621.0-h57928b3_1.conda
+  sha256: db8dead3dd30fb1a032737554ce91e2819b43496a0db09927edf01c32b577450
+  md5: 6797b005cd0f439c4c5c9ac565783700
+  constrains:
+  - vs2015_runtime >=14.29.30037
+  license: LicenseRef-MicrosoftWindowsSDK10
+  purls: []
+  size: 559710
+  timestamp: 1728377334097
+- conda: https://prefix.dev/conda-forge/win-64/vc-14.3-h5fd82a7_24.conda
+  sha256: 7ce178cf139ccea5079f9c353b3d8415d1d49b0a2f774662c355d3f89163d7b4
+  md5: 00cf3a61562bd53bd5ea99e6888793d0
+  depends:
+  - vc14_runtime >=14.40.33810
+  track_features:
+  - vc14
+  license: BSD-3-Clause
+  license_family: BSD
+  purls: []
+  size: 17693
+  timestamp: 1737627189024
+- conda: https://prefix.dev/conda-forge/win-64/vc14_runtime-14.42.34433-h6356254_24.conda
+  sha256: abda97b8728cf6e3c37df8f1178adde7219bed38b96e392cb3be66336386d32e
+  md5: 2441e010ee255e6a38bf16705a756e94
+  depends:
+  - ucrt >=10.0.20348.0
+  constrains:
+  - vs2015_runtime 14.42.34433.* *_24
+  license: LicenseRef-MicrosoftVisualCpp2015-2022Runtime
+  license_family: Proprietary
+  purls: []
+  size: 753531
+  timestamp: 1737627061911
+- conda: https://prefix.dev/conda-forge/win-64/vs2015_runtime-14.42.34433-hfef2bbc_24.conda
+  sha256: 09102e0bd283af65772c052d85028410b0c31989b3cd96c260485d28e270836e
+  md5: 117fcc5b86c48f3b322b0722258c7259
+  depends:
+  - vc14_runtime >=14.42.34433
+  license: BSD-3-Clause
+  license_family: BSD
+  purls: []
+  size: 17669
+  timestamp: 1737627066773
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..df4ab27
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,22 @@
+[project]
+authors = [{ name = "quantity-dev contributors" }]
+dependencies = ["optype>=0.9.0,<0.10"]
+name = "quantity-api"
+requires-python = ">= 3.12"
+version = "0.0.1.dev0"
+
+[build-system]
+build-backend = "hatchling.build"
+requires = ["hatchling"]
+
+[tool.pixi.project]
+channels = ["https://prefix.dev/conda-forge"]
+platforms = ["win-64", "linux-64", "osx-64", "osx-arm64"]
+
+[tool.pixi.pypi-dependencies]
+quantity_api = { path = ".", editable = true }
+
+[tool.pixi.tasks]
+
+[tool.pixi.dependencies]
+optype = ">=0.9.0,<0.10"
diff --git a/src/quantity_api/__init__.py b/src/quantity_api/__init__.py
new file mode 100644
index 0000000..9d4b56a
--- /dev/null
+++ b/src/quantity_api/__init__.py
@@ -0,0 +1,21 @@
+"""Quantity API."""
+
+from typing import Any, Final, Protocol, Self, runtime_checkable
+
+import optype as op
+
+type Unit = Any  # TODO: unit-api
+
+__version__: Final = "0.0.1.dev0"
+__all__ = ["__version__", "Quantity"]
+
+@runtime_checkable
+class Quantity[V, U: Unit](Protocol):
+    @property
+    def value(self) -> V: ...
+    @property
+    def unit(self) -> U: ...
+
+    ### Dunder Methods
+
+    def __eq__[B](self, other: Self[op.CanEq[V, B], U], /) -> B: ...