[Feature request] Math language for integers, decimals, fractions, exponents, operators, commas, symbols like pi

**What's your feature request? Please describe.**
Digits-only language support in Digital ink text recognition. Picking 1 as 'i', 0 as 'o' and 5 as 's' is a very prominent issue and makes this library un-useable. Precontext label helps a little bit, but ideally a digital-only (0-9) or Math language (which recognizes integers, decimals, fractions, exponents, operators, commas, symbols like pi or theta) should be the solution.

**Mobile environment**
Ideally both, but specifically ios.

**Additional context**
Add any other context or screenshots about the feature request here.