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Add PeekMap and adaptors::peek_map#809

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MiguelX413 wants to merge 1 commit into

rust-itertools:masterrust-itertools/itertools:masterfrom

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Add PeekMap and adaptors::peek_map#809
MiguelX413 wants to merge 1 commit into
rust-itertools:masterfrom
MiguelX413:master

Add `PeekMap` and `adaptors::peek_map`

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