Reparses all macro names in the array so that they may optionally include characters listed in allowedTokens.
This is used, for example, when parsing expl3 syntax which allows _ to be used in a macro name (even though
_ is normally stops the parsing for a macro name).
Reparses all macro names in the array so that they may optionally include characters listed in
allowedTokens. This is used, for example, when parsing expl3 syntax which allows_to be used in a macro name (even though_is normally stops the parsing for a macro name).