Behdad Esfahbod 776e1ce132 [cffLib.specializer] Fix CFF argument stack overflow
The code was always merging at least two blends, which was causing
stack-overflow with a test font of ours. Move the overflow check
earlier to catch that.

Fixes https://github.com/fonttools/fonttools/issues/3676
2024-11-05 10:38:00 -05:00
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