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Can't squash merge with merge.ff set to false

Not sure if this is intended or a bug, but with the following configuration:

$ git config --global merge.ff false

I am not able to merge my topic branch into master with squash option:

$ git checkout master
$ git merge --squash topic
fatal: You cannot combine --squash with --no-ff.

I'm not sure why a non-fast-forward merge would prevent a squash
merge, since by its very nature a squashed merge is not a fast forward
merge (or maybe it is if you only have one commit).

Is there an issue here? I like fast forward merges to be off by
default, since I want to control when they happen. Most of my merges
do not use --squash, so I'm catering to the common case.

Need advice on how to get past this issue. Thanks in advance.