allow hex values to be $xx as well as 0xxx

[pm100]

It makes sense in my use case where hex inputs are expected to be $fd

This is trivial to implement, I can do a PR. All your tests pass

But I am wondering if it might be a breaking change though and so there could be a switch for it. But I see that you do not have a place for switches like

• brace = { or [ or (
• decimal point = , or .
• ....

BTW - awesome tool, I get a ton of free features for very little effort. I worked a way round the &Value issue I had - although its still odd that one func returns a Value and the other returns a &Value