Problems discovered by ZeParser

[tmikov]

Problems reported by @pvdz here https://gist.github.com/pvdz/59540284f00f03f5f036591b46289c89

I was immediately able to reproduce two random ones I tried: https://github.com/pvdz/zeparser3/blob/master/tests/testcases/lexer_cases/numbers/decimal/5.pass.md https://github.com/pvdz/zeparser3/blob/master/tests/testcases/for_statement/for-of/lhs_edge_cases/yield_arg_lhs.md