Some operators revamped with curry flip#689

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matiboy wants to merge 10 commits intoReactiveX:curry-flipfrom

matiboy:curry-flip

Commits on Feb 6, 2023

Run emits _T_out
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Throttle first curry flipped
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Timestamp curry flipped
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Commits on Feb 7, 2023

Remove average extra check
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amb typing to match amb_ (add Future)
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todict curry flipped
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Commits on Feb 8, 2023

Take while curry flipped
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Add a test which uses both index and value
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Commits on Apr 13, 2023

More accurate documentation on single
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Black fixes
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