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## SV “Typing”

Perl scalars are supposed to be “untyped”, at least insofar as
strings/numbers. When conversing with other languages, though, or
serializing it’s usually helpful to break things down in greater
detail.

EasyXS defines an `exs_sv_type` macro that takes an SV as argument
and returns a member of `enum exs_sv_type_e` (typedef’d as just
`exs_sv_type_e`; see `easyxs_scalar.h` for values). The logic is compatible
with the serialization logic formulated during Perl 5.36’s development cycle.

## SV/Number Conversion

### `UV* exs_SvUV(SV* sv)`

Like `SvUV`, but if the SV’s content can’t be a UV
(e.g., the IV is negative, or the string has non-numeric characters)
an exception is thrown.

## SV/String Conversion