feature: allow reading into a 0-length array #3329
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Fix #3287. Mimic POSIX read() behaviour: if there is no bytes to read, return 0 and do nothing. Document the new behaviour.
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Fixes #3287
The Deno read* functions can now return 0 if the supplied buffer has no size. This doesn’t change the previous behaviour, it just adds a new return value.
I wrote one test in
readNullBufferFailurein /cli/js/files_test.ts, but if you think it is useless or in the wrong function you can drop the second commit.