[mypyc] Add primitive for bytes join() method #10929
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(We should probably switch to using |
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Part of mypyc/mypyc#880. |
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Description
This is mostly adapted from how it is done for str. We call undocumented API function _CPyBytes_Join which behaves similarly to the publicly available unicode one. Care is taken to deal with the case where we happen to have bytearray instead. As a result of needing to do the CheckExact anyway, we also support wonky subclasses of bytes.
Test Plan
Added both ir and runtime tests. Benchmark yielded reasonable gains but the benchmark also included concat which is likely slower than join.