maxstacksize = 250000000
	}

	// An upper limit for max stack size. Used to avoid random crashes
	// after calling SetMaxStack and trying to allocate a stack that is too big,
	// since stackalloc works with 32-bit sizes.
	maxstackceiling = 2 * maxstacksize

	// Allow newproc to start new Ms.
	mainStarted = true

	if haveSysmon {
		systemstack(func() {
			newm(sysmon, nil, -1)
		})
	}

*   Support for Python3.9 has been added.
*   `tf.data`:
    *   `tf.data` service now supports strict round-robin reads, which is useful
        for synchronous training workloads where example sizes vary. With strict
        round robin reads, users can guarantee that consumers get similar-sized
        examples in the same step.
    *   tf.data service now supports optional compression. Previously data would

	{V(MyStruct2{}), V(MyStruct1{})},

	// can convert *byte and *MyByte
	{V((*byte)(nil)), V((*MyByte)(nil))},
	{V((*MyByte)(nil)), V((*byte)(nil))},

	// cannot convert mismatched array sizes
	{V([2]byte{}), V([2]byte{})},
	{V([3]byte{}), V([3]byte{})},
	{V(MyBytesArray0{}), V([0]byte{})},
	{V([0]byte{}), V(MyBytesArray0{})},

	// cannot convert other instances