func (p Pointer[T]) Strong() *T {
	return (*T)(runtime_makeStrongFromWeak(p.u))
}

// Implemented in runtime.

//go:linkname runtime_registerWeakPointer
func runtime_registerWeakPointer(unsafe.Pointer) unsafe.Pointer

//go:linkname runtime_makeStrongFromWeak

	// It is always heap-allocated and must be explicitly kept
	// live so long as this special exists.
	handle *atomic.Uintptr
}

//go:linkname internal_weak_runtime_registerWeakPointer internal/weak.runtime_registerWeakPointer
func internal_weak_runtime_registerWeakPointer(p unsafe.Pointer) unsafe.Pointer {
	return unsafe.Pointer(getOrAddWeakHandle(unsafe.Pointer(p)))
}

var blockedLinknames = map[string][]string{
	// coroutines
	"runtime.coroswitch": {"iter"},
	"runtime.newcoro":    {"iter"},
	// weak references
	"internal/weak.runtime_registerWeakPointer": {"internal/weak"},
	"internal/weak.runtime_makeStrongFromWeak":  {"internal/weak"},
}

// check if a linkname reference to symbol s from pkg is allowed