Merge remote-tracking branch 'upstream/stable' into merge_stable

[MartinNowak]

No description provided.

[dlang-bot]

Thanks for your pull request, @MartinNowak!

Bugzilla references

Auto-close	Bugzilla	Description
✓	5904	std.json parseString doesn't handle chars outside the BMP
✓	17553	std.json should not do UTF decoding when encoding JSON
✓	17555	[REG2.070.0] Control characters in JSON data are invalid and should cause an exception
✓	17556	std.json encodes non-BMP characters incorrectly with JSONOptions.escapeNonAsciiChars
✓	17557	std.json should not do UTF decoding when parsing
✓	17564	std.experimental.allocator.theAllocator is null within shared static this

[wilzbach]

Enforce space between a .. b
grep -nrE '[[:alnum:]][.][.][[:alnum:]]|[[:alnum:]] [.][.][[:alnum:]]|[[:alnum:]][.][.] [[:alnum:]]' $(find etc std -name '*.d' | grep -vE 'std/string.d|std/uni.d') ; test $? -eq 1
std/json.d:1179:                        foreach (wc; wchars[0..wNum])
make: *** [style_lint] Error 1

Not sure how this managed to get through in the first place, but I amended a commit to fix it.

[wilzbach]

PRs @ Phobos need to be approved ;-)

[wilzbach]

Not sure, why the bot only commented now. Please verify @MartinNowak

[MartinNowak]

Not sure how this managed to get through in the first place, but I amended a commit to fix it.

Maybe you're not testing on stable, or maybe because everyone ignores CircleCI, since it fails quite often and takes ages to load logs.