Why is PUSH(r32/m32) not supported?

[Ou7law007]

Error: "Invalid operand types: PUSH r32"

From the source code:

class PUSH(Instruction):
    """Push Value Onto the Stack"""

    def __init__(self, *args, **kwargs):
        """Supported forms:

            * PUSH(imm32)
            * PUSH(r16/m16)
            * PUSH(r64/m64)
        """

Is it intended that PUSH(r32/m32) is missing?
Same for POP