Shadda_damma-ar vs shaddaDamma-ar

I have a few shadda ligatures, I want to name them:

shadda_dammatan-ar
shadda_damma-ar
shadda_fathatan-ar
shadda_fatha-ar
shadda_kasratan-ar
shadda_kasra-ar

But Glyphs will immediately rename them shaddaDammatan-ar, shaddaDamma-ar, etc, but I don’t want this since these are legacy spacing glyphs and the ligatures I’m creating are unencoded mark ligatures.

To make matters worse, I already have shaddaDammatan-ar etc. as encoded glyphs, so I now have duplicate glyph names.

I solved my immediate issue by adding explicit entries for these ligatures is my custom GlyphData.xml file, but it would be good if Glyphs does not do this kind of renaming by default.

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