A variable is override in the source code.

Code

Is it normal that "/.notdef" is declared (first link) and override in the same file later (second link) :

https://github.com/py-pdf/pypdf/blob/main/pypdf/_codecs/adobe_glyphs.py#L51
https://github.com/py-pdf/pypdf/blob/main/pypdf/_codecs/adobe_glyphs.py#L13968