Function extract_storable_array_sizes 

pub(crate) fn extract_storable_array_sizes(
    attrs: &[Attribute],
) -> Result<Option<Vec<usize>>>

Extracts array sizes from the #[storable_arrays(...)] attribute.

Parses attributes like #[storable_arrays(1, 2, 4, 8)] and returns a vector of the specified sizes. Returns None if the attribute is not present.

Format

The attribute should be a comma-separated list of positive integer literals:

#[storable_arrays(1, 2, 4, 8, 16, 32)]

Errors

Returns an error if:

• The attribute is present but has invalid syntax
• Any size is 0 or exceeds 256
• Duplicate array sizes are specified