git svn dcommit COMMIT silently checks in everything if COMMIT is not a complete revision

If I run

git svn dcommit COMMIT

with COMMIT being an unambiguous, but partial revision string, it
behaves like git svn dcommit, i.e. commits everything. (If I remember
to copy and paste the whole nine yards of the revision string, it
works as expected, i.e. commits just that revision.)

I'd expect it to work like other git commands, and understand partial
revision strings, or at least bail out saying it was an invalid
revision.

-- 
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