thick-masks-lie

Added new getZeroableNullableCodec and getZeroableOptionCodec functions

These functions rely on a zero value to represent None or null values as opposed to using a boolean prefix.

const codec = getZeroableNullableCodec(getU16Codec());
codec.encode(42); // 0x2a00
codec.encode(null); // 0x0000
codec.decode(new Uint8Array([42, 0])); // 42
codec.encode(new Uint8Array([0, 0])); // null

Both functions can also be provided with a custom definition of the zero value using the zeroValue option.

const codec = getZeroableNullableCodec(getU16Codec(), {
    zeroValue: new Uint8Array([255, 255]),
});
codec.encode(42); // 0x2a00
codec.encode(null); // 0xfffff
codec.encode(new Uint8Array([0, 0])); // 0
codec.decode(new Uint8Array([42, 0])); // 42
codec.decode(new Uint8Array([255, 255])); // null