A recent comment http://stackoverflow.com/a/18027030/717355 on a
question I asked two years ago about 'grafts' and 'replace' indicates
that users think that 'git replace' can't replace a merge commit. The
documentation doesn't have any examples and gives the naive impression
that one should only replace a simple commit with another simple commit.
Having looked at the code, I realised that anything can be replaced with
anything, which is perhaps not what was intended. A simple thought is
that the replace should be like-for-like with regard to object type,
though that would not include replacing a sub-module for a tree (and
Should 'git replace' check the object types to ensure they are sensible?
Would it be reasonable to add examples to indicate the range of
replacements, and how to prepare alternative merge commits, or is that a
hostage to fortune?
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