Initially introduced in 1.18, Kubernetes 1.20 now enables API Priority and Fairness (APF) by default. This allows `kube-apiserver` to [categorize incoming requests by priority levels](https://docs.k8s.io/concepts/cluster-administration/flow-control/).

### IPv4/IPv6 run

	SYS_DELETEWO                        = 0x4B9 // 1209
	SYS_DELETEWORKUNIT                  = 0x4B9 // 1209
	SYS_QUERYMET                        = 0x4BA // 1210
	SYS_QUERYMETRICS                    = 0x4BA // 1210
	SYS_QUERYSCH                        = 0x4BB // 1211
	SYS_QUERYSCHENV                     = 0x4BB // 1211
	SYS_CHECKSCH                        = 0x4BC // 1212

	CMPBGE	R2, R3, 0(PC)          // ec230000a064

	CMPBNE	R1, $-127, 0(PC)       // ec170000817c
	CMPBEQ	R3, $0, 0(PC)          // ec380000007c
	CMPBLT	R5, $128, 0(PC)        // ec540000807c
	CMPBLE	R7, $127, 0(PC)        // ec7c00007f7c
	CMPBGT	R9, $0, 0(PC)          // ec920000007c
	CMPBGE	R2, $128, 0(PC)        // ec2a0000807c

	CMPUBNE	R1, R2, 0(PC)          // ec1200007065

Leonardo Sarra <******@****.***> 1717533426 +0200

rm go.work
go work init
env GOTOOLCHAIN=local
! go work use ./m1_22_0
stderr '^go: m1_22_0'${/}'go.mod requires go >= 1.22.0 \(running go 1.21; GOTOOLCHAIN=local\)$'
env GOTOOLCHAIN=auto
go work use ./m1_22_0
stderr '^go: m1_22_0'${/}'go.mod requires go >= 1.22.0; switching to go1.22.9$'
grep '^go 1.22.0$' go.work
grep '^toolchain go1.22.9$' go.work

# work use with an even newer module should bump go again.
go work use ./m1_22_1

Flask==3.0.2
Flask-Bootstrap==3.3.7.1
Flask-JSON==0.4.0
future==0.18.3
json2html==1.3.0
opentelemetry-api==1.22.0
opentelemetry-instrumentation==0.43b0
opentelemetry-instrumentation-flask==0.43b0
opentelemetry-instrumentation-wsgi==0.43b0
opentelemetry-propagator-b3==1.22.0
opentelemetry-sdk==1.22.0
opentelemetry-semantic-conventions==0.43b0
opentelemetry-util-http==0.43b0
prometheus-client==0.19.0
requests==2.31.0
simplejson==3.19.2

	T{3, 4},
}

var _ = []T{
	T{},
	T{1, 2},
	T{3, 4},
}

var _ = []T{
	T{},
	10: T{1, 2},
	20: T{3, 4},
}

var _ = []struct {
	x, y int
}{
	struct{ x, y int }{},
	10: struct{ x, y int }{1, 2},
	20: struct{ x, y int }{3, 4},
}

var _ = []interface{}{
	T{},
	10: T{1, 2},
	20: T{3, 4},
}

var _ = [][]int{
	[]int{},
	[]int{1, 2},
	[]int{3, 4},
}

var _ = [][]int{

	reset()

	ev := RegisterFloatVar(testVar, 123.0, "")
	v, present := ev.Lookup()
	if v != 123.0 {
		t.Errorf("Expected 123.0, got %v", v)
	}
	if present {
		t.Errorf("Expected not present")
	}

	v = ev.Get()
	if v != 123.0 {
		t.Errorf("Expected 123.0, got %v", v)
	}

	_ = os.Setenv(testVar, "XXX")

	ev = RegisterFloatVar(testVar, 123.0, "")
	v, present = ev.Lookup()
	if v != 123.0 {

env TESTGO_VERSION_SWITCH=switch
rm go.work
env GOTOOLCHAIN=local
! go work init ./m1_22_0
stderr '^go: m1_22_0'${/}'go.mod requires go >= 1.22.0 \(running go 1.21; GOTOOLCHAIN=local\)$'
env GOTOOLCHAIN=auto
go work init ./m1_22_0
stderr '^go: m1_22_0'${/}'go.mod requires go >= 1.22.0; switching to go1.22.9$'
cat go.work
grep '^go 1.22.9$' go.work

// the overall language version; the first release is "1.x.0".
// The distinction is important because the relative ordering is
//
//	1.21 < 1.21rc1 < 1.21.0
//
// meaning that Go 1.21rc1 and Go 1.21.0 will both handle go.mod files that
// say "go 1.21", but Go 1.21rc1 will not handle files that say "go 1.21.0".
func IsLang(x string) bool {
	return gover.IsLang(x)
}

// Lang returns the Go language version. For example, Lang("1.2.3") == "1.2".