This is my first contribution so I'm still trying to find my feet.
The current problem is after this function passes the array containing strings to _from_sequence_of_strings(), we lose track of what decimal point we should use. As a result, a latter function floatify() cannot parse the string correctly since they are trying to parse the string with ".". Is it ok if I add additional parameters to all the following functions to indicate this decimal point? Or is that inefficient too?

This needs restructuring of the casting logic. This is non-trivial.

Thanks for the pull request, but it appears to have gone stale. If interested in continuing, please merge in the main branch, address any review comments and/or failing tests, and we can reopen.