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I'd not spotted that before reading your comment, and went looking expecting a double-width ligature, which would be quite cool. Squeezing the ligature into a single character width seems sub-optimal for a monospaced font.

I've done the same with my own programming font (mononoki http://madmalik.github.io/mononoki/ ) There is a difference between a ligature that a font may provide when you type in f and i and the unicode point 'LATIN SMALL LIGATURE FI', that is in there for historical reasons.

the first one would make sense as double width character, the second one should be single width to show, that the unicode point 'LATIN SMALL LIGATURE FI' is meant

That's an interesting point. But in this case, I had typed 'fl' and 'fi', so surely your first clause applies?

What does 'mono-space' even mean if they're going to do that!

I just created a variant that removes the ligatures, it's called "Space Mono NL":

http://tweetcompressor.com/temp/spacemono-nl.zip