Handler must be a type alias, and keep it to handler pkg

Author: lainio

err2.go

@@ -11,7 +11,7 @@ type (
 	// Handler is a function type used to process error values in Handle and
 	// Catch. We currently have a few build-ins of the Handler: err2.Noop,
 	// err2.Reset, etc.
-	Handler = func(error) error
+	Handler = handler.ErrorFn
 )
 
 var (

handlers.go

@@ -5,17 +5,8 @@ import (
 	"os"
 )
 
-// Handlers is a helper to call several error handlers in a sequence.
-//
-//	defer err2.Handle(&err, err2.Handlers(err2.Log, MapToHTTPErr))
-func Handlers(f ...Handler) Handler {
-	return func(err error) error {
-		for _, handler := range f {
-			err = handler(err)
-		}
-		return err
-	}
-}
+	"github.com/lainio/err2/internal/handler"
+)
 
 // Stderr is a built-in helper to use with Handle and Catch. It prints the
 // error to stderr and it resets the current error value. It's a handy Catch