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The call-sites are replaced by direct `typeof`-checks instead, which removes unnecessary function calls. Note that in the `src/`-folder we already had more `typeof`-cases than `isNum`-calls. These changes were *mostly* done using regular expression search-and-replace, with two exceptions: - In `Font._charToGlyph` we no longer unconditionally update the `width`, since that seems completely unnecessary. - In `PDFDocument.documentInfo`, when parsing custom entries, we now do the `typeof`-check once.