if pp != nil {
		// Overflow records in profBuf have all header values set to zero. Make
		// sure that real headers have at least one bit set.
		hdr[0] = uint64(pp.id)<<1 | 0b1
	} else {
		hdr[0] = 0b10
	}
	if gp != nil {
		hdr[1] = gp.goid
	}
	hdr[2] = uint64(mp.procid)

	// Allow only one writer at a time
	for !trace.signalLock.CompareAndSwap(0, 1) {

	case Complex128:
		return a.assignFloatN(offset, 8, 2)
	case String:
		return a.assignIntN(offset, goarch.PtrSize, 2, 0b01)
	case Interface:
		return a.assignIntN(offset, goarch.PtrSize, 2, 0b10)
	case Slice:
		return a.assignIntN(offset, goarch.PtrSize, 3, 0b001)
	case Array:
		tt := (*arrayType)(unsafe.Pointer(t))
		switch tt.Len {
		case 0:
			// There's nothing to assign, so don't modify

  // begin: should be (0, -1, 0) or (-1, 0, 0) if it's time-majored.
  // new_axis_mask: should always be 0.
  // ellipsis_mask: should always be 0.
  // begin_mask & end_mask: should be 0b101 = 5 or 0b110 = 4 if it's
  // time-majored. shrink_axis_mask: should be 0b010 = 2 or 0b001 = 1 if it's
  // time-majored.
  SmallVector<int64_t, 2> last_output_shape({batch, n_output});

	// Numbers
	{"decimal", "{{print 1234}}", "1234", tVal, true},
	{"decimal _", "{{print 12_34}}", "1234", tVal, true},
	{"binary", "{{print 0b101}}", "5", tVal, true},
	{"binary _", "{{print 0b_1_0_1}}", "5", tVal, true},
	{"BINARY", "{{print 0B101}}", "5", tVal, true},
	{"octal0", "{{print 0377}}", "255", tVal, true},
	{"octal", "{{print 0o377}}", "255", tVal, true},

	// we make sure to make the P field always non-zero: The ID of a real P will
	// start at bit 1, and bit 0 will be set. Samples that arrive while no P is
	// running (such as near syscalls) will set the first header field to 0b10.
	// This careful handling of the first header field allows us to store ID of
	// the active G directly in the second field, even though that will be 0
	// when sampling g0.
	//