Extend the existing tests for `f32` and `f64` with versions that include
`f16`'s new printing and parsing implementations.
Co-authored-by: Speedy_Lex <alex.ciocildau@gmail.com>
The previous commit renamed `Decimal` to `DecimalSeq`. Now, rename the
type that represents a decimal floating point number to be `Decimal`.
Additionally, add some tests for internal behavior.