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    dirstate-v2: Replace the 32-bit `mode` field with two bits · 4d5a13253d34
    Simon Sapin authored
    Previously we stored the entire value from `stat_result.st_mode`,
    like dirstate-v1 does. However only the executable permission
    and type of file (only symbolic links and normal files are supported)
    are relevant to Mecurial.
    
    So replace this field with two bits in the existing bitfield byte.
    For now the unused space is left as padding, as it will be used
    for something else soon.
    
    Differential Revision: https://phab.mercurial-scm.org/D11635
    4d5a13253d34