Mat4Like:
    | [
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
        number,
    ]
    | FloatArray

A 4x4 Matrix given as a Mat4, a 16-element floating-point TypedArray, or an array of 16 numbers.