Don't treat nullish values as default values, to allow clearing fields even when a default value is set

packages/standard-components/src/forms/InnerForm.svelte

@@ -92,21 +92,19 @@
         return
       }
 
-      const newValue = value == null ? defaultValue : value
-      const newError = validate ? validate(newValue) : null
-
       // Update field state
+      const error = validate ? validate(value) : null
       fieldState.update(state => {
-        state.value = newValue
-        state.error = newError
+        state.value = value
+        state.error = error
         return state
       })
 
       // Update form state
       formState.update(state => {
-        state.values = { ...state.values, [field]: newValue }
-        if (newError) {
-          state.errors = { ...state.errors, [field]: newError }
+        state.values = { ...state.values, [field]: value }
+        if (error) {
+          state.errors = { ...state.errors, [field]: error }
         } else {
           delete state.errors[field]
         }
@@ -114,7 +112,7 @@
         return state
       })
 
-      return !newError
+      return !error
     }
 
     const clearValue = () => {