Rename ELF extension `map` to `tryConverting` and make internal
As originally pointed out in #48 (closed), the
map prefix alone is not enough context into what the method actually does.
Since it fails the future, and isn't a mapping function, the name should reflect this.
But, this method as-is currently provides little value outside of the client context, so it should not be
If users provide an adequate use case for having it outside of the package, then it can be made public again.
- Rename: ELF where Value == RESPValue extension
tryConvertingfrom public to internal
A "problematic" method should no longer be available for API users to hurt themselves with.