Rust errors and scalar types

The safe crate exposes explicit error and scalar representations.

`Error`

rust

pub enum Error

A failed Table operation.

Variant	Meaning
`InvalidArgument`	A pointer, count, coordinate, or finite-value requirement was violated.
`InvalidState`	A native descriptor was not initialised for the requested operation.
`InvalidAxis`	An axis was empty, non-finite, unordered, or collided after float32 conversion.
`IndexOutOfRange`	An axis or cell index exceeded the table dimensions.
`TypeMismatch`	A value or replacement used a different scalar representation.
`DimensionMismatch`	Rust slices did not describe the required curve or map shape.
`SizeOverflow`	Multiplying map dimensions overflowed `usize`.

rust

pub trait Scalar: private::Sealed + Copy + Debug + PartialEq + Send + Sync + 'static

A scalar representation supported by the native Table core.

rust

pub enum ScalarType

A supported scalar storage representation.

Variant	Meaning
`I8`	Signed 8-bit integer.
`U8`	Unsigned 8-bit integer.
`I16`	Signed 16-bit integer.
`U16`	Unsigned 16-bit integer.
`I32`	Signed 32-bit integer.
`U32`	Unsigned 32-bit integer.
`F32`	IEEE-754 single-precision floating point.