SDK re-initializes a provider already bound to another domain, causing multi-Init

[erka]

Observed behavior

Every Set*Provider call runs Init on the newly registered provider unconditionally - even when that provider instance is already active on another domain.

OpenFeature spec requirement 1.1.2.2: "Provider instances which are already active (because they have been bound to another domain or otherwise) need not be initialized again."

Expected Behavior

Binding an already-active provider to another domain skips Init and reports readiness from the provider's existing state.

Steps to reproduce

func TestRequirementMultiBound(t *testing.T) {
	inited := atomic.Bool{}
	sh := &stateHandlerForTests{
		// Semaphore must be invoked
		initF: func(e EvaluationContext) error {
			if inited.Swap(true) {
				return fmt.Errorf("ready initialized")
			}
			return nil
		},
	}
	provider := struct {
		FeatureProvider
		StateHandler
	}{
		FeatureProvider: NoopProvider{},
		StateHandler:    sh,
	}

	api := newAPI()
	t.Cleanup(func() {
		_ = api.Shutdown(context.Background())
	})

	err := api.SetProviderAndWait(t.Context(), provider)
	if err != nil {
		t.Errorf("can't set default: %v", err)
	}
	err = api.SetProviderAndWait(t.Context(), provider, WithDomain("domain"))
	if err != nil {
		t.Errorf("can't set domain: %v", err)
	}
}

Result:

--- FAIL: TestRequirementMultiBound (0.00s)
    openfeature_test.go:88: can't set domain: failed to initialize named provider "NoopProvider" for domain "domain": ready initialized