Function encode_custom_attribute_argument 

pub fn encode_custom_attribute_argument(
    arg: &CustomAttributeArgument,
    buffer: &mut Vec<u8>,
) -> Result<()>

Encodes a single custom attribute argument value into binary format.

This function handles all supported .NET types according to the ECMA-335 specification, using the appropriate binary encoding for each type variant.

Arguments

• arg - The argument to encode
• buffer - The output buffer to write encoded data to

Type Encoding

Each type is encoded according to its specific format:

• Primitives: Little-endian binary representation
• Strings: Compressed length + UTF-8 data (or 0xFF for null)
• Arrays: Compressed length + encoded elements
• Enums: Underlying type value (type name encoded separately in named args)

Errors

Returns [crate::Error::Malformed] in the following cases:

• Char: Character code point exceeds 0xFFFF (outside Basic Multilingual Plane)
• String: String length exceeds compressed uint maximum (0x1FFFFFFF bytes)
• Array: Array length exceeds u32 maximum (4,294,967,295 elements)
• Recursive errors from nested array element encoding