`-` is interpretated as a number rather than a string

[krtschmr]

https://github.com/rubysolo/dentaku/blob/main/lib/dentaku/ast/comparators.rb#L32

would not match on IF(b11="-", 0, 1) which then follows to convert it to BigDecimal, yet "-" is a string

the regex is -?\d*(\.\d+)? which reads like "an optional minus sign, followed by an optional digit and an option dot or digit"

while -.5 should be matched (it's up for discussion i guess) clearly a -. isn't a number and neither is -

[krtschmr]

i fixed it now by explicitly returning if it's either - or -.. both values would match the regex otherwise and thus been casted to BigDecimal. Works great for our project now! 💪🏿