C23 (implementations of proposals finished in 2021 and formally adopted in 2022 as planned) will natively support _Decimal32 _Decimal64 and _Decimal128.

This is one of the biggest changes C had since C99. Presumably it'll create an enormous pressure on all other languages to support decimal floating point as basic number type.

Til could reconsider whether making all float literals (and all floating point arithmetics) a decimal floating point number wouldn't be the easier way to go. Otherwise if it won't be part of Til at that time, Til will have a hard time to catch up unless breaking backwards compatibility will not be an issue. Such a change takes years which is really no good for a new language.

I'd recommend using mpdecimal library (CPython uses it as well) if decimal floats shall become part of Til.

Note also I personally don't think there is any need for making floats BigDecimal by default.