• [designspaceLib] When splitting a DesignSpace v5 document with makeNames=True (as varLib.build_many does), family and style names set explicitly on an instance now take precedence over the ones computed from the STAT labels, in all languages, and a PostScript name is no longer made up from the labels for an instance that has its own style name (#3131, #4206, #4208).
• [cmap] Decompiling a format 4 subtable whose idRangeOffset points outside glyphIndexArray now raises TTLibError. A negative index used to silently map the code point to the wrong glyph, and one past the end raised a bare AssertionError (#4209).
• [cmap] Fix compiling a format 2 subtable when the lowest glyph ID in a lead-byte row is 32768 or higher, which failed with struct.error (#4210).