fix: Remove func constraint.

CHANGELOG.md

@@ -1,3 +1,9 @@
+### 4.1.1 - 2020-01-29
+
+#### 🐞 Fixes
+
+- **[func]** Removed the generic constraint as it is too restrictive.
+
 ## 4.1.0 - 2020-01-20
 
 #### 🚀 Updates

src/Predicate.ts

@@ -451,6 +451,6 @@ export function custom<T, S extends object = {}>(
   return new Predicate<T>('custom', defaultValue).custom(callback);
 }
 
-export function func<T extends FuncOf = FuncOf>(defaultValue: T | null = null) /* infer */ {
+export function func<T = FuncOf>(defaultValue: T | null = null) /* infer */ {
   return new Predicate<T | null>('function', defaultValue, true).nullable();
 }