Type create/validate to accept an instance type

Author: thegedge

src/core/type/type.ts

@@ -93,7 +93,7 @@ export interface IType<C, S, T> {
    *
    * @returns An instance of that type.
    */
-  create(snapshot?: C, env?: any): this["Type"]
+  create(snapshot?: C | T, env?: any): this["Type"]
 
   /**
    * Checks if a given snapshot / instance is of the given type.
@@ -110,7 +110,7 @@ export interface IType<C, S, T> {
    * @param context Validation context, an array of { subpaths, subtypes } that should be validated
    * @returns The validation result, an array with the list of validation errors.
    */
-  validate(thing: C, context: IValidationContext): IValidationResult
+  validate(thing: C | T, context: IValidationContext): IValidationResult
 
   /**
    * Gets the textual representation of the type as a string.

src/types/complex-types/model.ts

@@ -125,7 +125,7 @@ type DefinablePropsNames<T> = { [K in keyof T]: IsOptionalValue<T[K], never, K>
 
 /** @hidden */
 export type ExtractCFromProps<P extends ModelProperties> = MaybeEmpty<{
-  [k in keyof P]: P[k]["CreationType"]
+  [k in keyof P]: P[k]["CreationType"] | P[k]["TypeWithoutSTN"]
 }>
 
 /** @hidden */