Re: [PATCH 1/3] merge-file: add option to specify the marker size

Bert Wesarg [off-list ref] writes:

Signed-off-by: Bert Wesarg <redacted>

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This can probably improved in a way, that the marker size will be taken
from attributes. This could be done by an explicit --marker-size-by-path
option or an option which names one of the three input files as a git
path.

You don't want any option that is specifically about "marker size".  An
option to specify the path to take attributes for would be the right way
to go.  You might want to see "hash-object --path" for an inspiration.