diff --git a/src/workerd/io/compatibility-date.capnp b/src/workerd/io/compatibility-date.capnp
index cf9dae5dc92..48ce0b2089c 100644
--- a/src/workerd/io/compatibility-date.capnp
+++ b/src/workerd/io/compatibility-date.capnp
@@ -1229,7 +1229,8 @@ struct CompatibilityFlags @0x8f8c1b68151b6cef {
 
   fetchIterableTypeSupport @146 :Bool
     $compatEnableFlag("fetch_iterable_type_support")
-    $compatDisableFlag("no_fetch_iterable_type_support");
+    $compatDisableFlag("no_fetch_iterable_type_support")
+    $compatEnableDate("2026-02-19");
   # Enables passing sync and async iterables as the body of fetch Request or Response.
   # Previously, sync iterables like Arrays would be accepted but stringified, and async
   # iterables would be treated as regular objects and not iterated over at all. With this
@@ -1239,6 +1240,7 @@ struct CompatibilityFlags @0x8f8c1b68151b6cef {
   # that allows this behavior and allows sync Generator and AsyncGenerator objects to be
   # included in kj::OneOf declarations safely with strings and other types. When enabled,
   # strings are ignored but Arrays will be treated as iterables and not stringified as before.
+  # Also see fetchIterableTypeSupportOverrideAdjustment.
 
   envModuleNullableSupport @147 :Bool
     $compatEnableFlag("env_module_nullable_support")
diff --git a/types/generated-snapshot/latest/index.d.ts b/types/generated-snapshot/latest/index.d.ts
index 7f817123e7b..97003099dfa 100755
--- a/types/generated-snapshot/latest/index.d.ts
+++ b/types/generated-snapshot/latest/index.d.ts
@@ -1913,7 +1913,9 @@ type BodyInit =
   | ArrayBufferView
   | Blob
   | URLSearchParams
-  | FormData;
+  | FormData
+  | Iterable<ArrayBuffer | ArrayBufferView>
+  | AsyncIterable<ArrayBuffer | ArrayBufferView>;
 declare abstract class Body {
   /* [MDN Reference](https://developer.mozilla.org/docs/Web/API/Request/body) */
   get body(): ReadableStream | null;
diff --git a/types/generated-snapshot/latest/index.ts b/types/generated-snapshot/latest/index.ts
index 1d06a2d4f15..8954e60d829 100755
--- a/types/generated-snapshot/latest/index.ts
+++ b/types/generated-snapshot/latest/index.ts
@@ -1918,7 +1918,9 @@ export type BodyInit =
   | ArrayBufferView
   | Blob
   | URLSearchParams
-  | FormData;
+  | FormData
+  | Iterable<ArrayBuffer | ArrayBufferView>
+  | AsyncIterable<ArrayBuffer | ArrayBufferView>;
 export declare abstract class Body {
   /* [MDN Reference](https://developer.mozilla.org/docs/Web/API/Request/body) */
   get body(): ReadableStream | null;