Cannot enable the "ss07" feature in FiraCode font

Greetings, I’m trying to enable the ss07 feature in FiraCode font, but it doesn’t working.

Command:

pyftfeatfreeze -n -v -f "ss07" FiraCode-Regular.ttf FiraCode-Regular-ss07.ttf

Output:

INFO: [RemapByOTL] Running with options: Namespace(features='ss07', info=False, inpath='FiraCode-Regular.ttf', lang=None, names=True, outpath='FiraCode-Regular-ss07.ttf', rename=False, replacenames='', report=False, script='latn', usesuffix='', verbose=True, zapnames=False)
INFO: [openFont] Opened font: FiraCode-Regular.ttf
INFO: [filterFeatureIndex] FeatureIndex: [3, 19, 35, 51, 67, 93, 109, 125, 141, 157, 173, 189, 205, 221, 237, 253, 269, 285, 301, 317, 333, 349]
INFO: [filterLookupList] Features to apply: ['ss07']
INFO: [filterLookupList] Lookups: [138, 139]

INFO: [saveFont] Saved font: FiraCode-Regular-ss07.ttf
INFO: Finished processing.

This command with these feature works fine:

pyftfeatfreeze -n -v -f "ss01,ss03,ss05" FiraCode-Regular.ttf FiraCode-Regular-ss01-03-05.ttf

[MuTsunTsai]

@mrbaungartner I made a new app that can handle your needs. Please check it out: https://mutsuntsai.github.io/fontfreeze/

[MuTsunTsai]

@MarcosBaungartner Did you use the latest version of FiraCode (6.002)? I have no problem generating ss01-03-05-08 with weight 450 using FiraCode-VF.ttf. And please, do report further issue directly in the FontFreeze repo, as I won’t be routinely checking replies here, and any further discussion would be off-topic here.