Reduce heap allocs 2 (#46)

* reduce heap allocations in tcp logging; omit use of AppendFloat which allocates a metric sh*tton

* debugheaplog: better heap statistic logging

* heap: use string for pcap.Frame.Protocol

* add potential to eliminate Flags.String heap alloc, remove incorrect HEAP comments

* add StackAsync.DebugErr and httpraw.SetBytes

* many heap alloc reductions and replacement of bytes.Equal with internal.BytesEqual

internal/slices.go

@@ -1,5 +1,7 @@
 package internal
 
+import "unsafe"
+
 // IsZeroed returns true if all arguments are set to their zero value.
 func IsZeroed[T comparable](a ...T) bool {
 	var z T
@@ -65,3 +67,15 @@ func SliceReclaim[T any](ptr *[]T) *T {
 	}
 	return &(*ptr)[n]
 }
+
+// BytesEqual is heapless replacement of [bytes.Equal] since it allocates in tinygo.
+// https://github.com/tinygo-org/tinygo/issues/4045
+func BytesEqual(a, b []byte) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	if len(a) == 0 {
+		return true
+	}
+	return unsafe.String(&a[0], len(a)) == unsafe.String(&b[0], len(b))
+}