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bdb0be2017
* fix: Support `\let` via `macros` option Issue #3737 turned out to be how we handled the return value of `expandOnce`. We assumed that, if the return value isn't an `Array`, it's an `instanceof Token`. This isn't necessary true with a user's `macros` object, and given that we don't currently export `Token`, it's pretty difficult to bypass. Given that we never actually use the array return values from `expandOnce`, I changed the return value for `expandOnce` to either a `number` (to indicate the number of expanded tokens, so you could still look up the tokens in the stack if you wanted to) or `false` (to indicate no expansion happened). We can't use `0` for the latter because an actual expansion might result in zero tokens. The resulting code is arguably cleaner. I also documented that `macros` can have object expansions, and specified how to simulate `\let`. Fixes #3737 * Revise macros documentation according to comments