Considering switching the mathable fields in Typica away from using the ECMA-262 host environment and instead letting SQLite do the arithmetic for me because that's less work than implementing a proper solution myself, is less work and doesn't come with license issues compared with some of the libraries I looked at, and Typica 2 already has an SQLite dependency anyway and has better behavior for this use case.
There's work on getting decimal floats into C and I wouldn't be surprised if C++ just absorbed that once it's ready, and I would expect this to also behave better for this use case so I can revisit that decision some time next decade.