Add null-checks for each function that takes an `IAsyncEnumerable` or otherwise nullable type#127

Merged

abelbraaksma merged 11 commits intomainfrom add-nullchecks

Dec 19, 2022

+923-539

Commits on Dec 19, 2022

Add null-checks for each function that takes an IAsyncEnumerable or otherwise nullable type
abelbraaksma
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Fix some signatures that used flexible types, but shouldn't have
abelbraaksma
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Add first tests for this
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A bit of cleanup along the way, consistency in coding
abelbraaksma
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Add more null-check tests, null-source should raise immediately, not after MoveNext
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Add multi-iteration side-effect tests for TaskSeq.isEmpty and TaskSeq.empty
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Add null-source and related tests for all other TaskSeq functions
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Elide the null-check in the returned task or taskSeq, instead, fail-fast
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Fix tests by always lifting null-checking internal function outside of taskSeq or task CE, or it may not fire in time
abelbraaksma
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Add some more tests
abelbraaksma
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Fix by adding back takeWhileXXX after rebasing faux pas
abelbraaksma
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