Object syntax doesn't allow keywords (to, mod, in, etc) as keys

[WesleyKapow]

math.parse('{from: 5, to: 7}')
fails with:
math.js:46660 Uncaught SyntaxError: Symbol or string expected as object key (char 11)

This fails for all of the keywords in the syntax: mod, and, not, or, xor, to, in.

Tested version: 6.2.2.

[josdejong]

Thanks for your suggestion Wesley, it would be nice indeed if we could use keywords as object properties. Should be possible I think.

[Veeloxfire]

Problem to me seems that, when assigning the toke type, all NAMED_DELIMITERS are assigned as TOKENTYPE.DELIMITER where they are actually usable as TOKENTYPE.SYMBOL in this context.
Maybe adding TOKENTYPE.NAMED_DELIMITER or having state.tokenType be an array instead so if there are more than one options then it could go through in order of priorty. If it would crash on a certain option it could revert to the second etc.
This would involve a lot of rewriting though so maybe just easier to have the extra option on TOKENTYPE

EDIT:
Another option is to do what is done elsewhere and use:
state.tokenType === TOKENTYPE.SYMBOL || (state.tokenType === TOKENTYPE.DELIMITER && state.token in NAMED_DELIMITERS)
This works and doesnt influence other cases

[josdejong]

This issue is fixed now in mathjs@6.6.3

[josdejong]

Thanks again @Veeloxfire