view mercurial/help/common.txt @ 31650:23391acfc421

py3: fix manifestdict.fastdelta() to be compatible with memoryview

This doesn't look nice, but a straightforward way to support Python 3.
bytes(m[start:end]) is needed because a memoryview doesn't support ordering
operations. On Python 2, m[start:end] returns a bytes object even if m is
a buffer, so calling bytes() should involve no additional copy.

I'm tired of trying cleaner alternatives, including:

 a. extend memoryview to be compatible with buffer type
    => memoryview is not an acceptable base type
 b. wrap memoryview by buffer-like class
    => zlib complains it isn't bytes-like

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