pub fn merge_font(font: Font)Expand description
Merge font attributes into the current font, locally — the change reverts with the enclosing TeX group.
Port of Perl Package.pm:MergeFont L441-444
(AssignValue(font => LookupValue('font')->merge(@kv), 'local')). Only the
attributes font actually specifies are taken; the rest are inherited from
the font in force. See merge_font_ref to merge without moving the font.