Always match commands before arguments.

context.go

@@ -264,11 +264,9 @@ func (c *Context) trace(node *Node) (err error) { // nolint: gocyclo
 				break
 			}
 
-			// After positional arguments have been consumed, handle commands and branching arguments.
+			// After positional arguments have been consumed, check commands next...
 			for _, branch := range node.Children {
-				switch branch.Type {
+				if branch.Type == CommandNode && branch.Name == token.Value {
-				case CommandNode:
-					if branch.Name == token.Value {
 					c.scan.Pop()
 					c.Path = append(c.Path, &Path{
 						Parent:  node,
@@ -278,8 +276,11 @@ func (c *Context) trace(node *Node) (err error) { // nolint: gocyclo
 					})
 					return c.trace(branch)
 				}
+			}
 
-				case ArgumentNode:
+			// Finally, check arguments.
+			for _, branch := range node.Children {
+				if branch.Type == ArgumentNode {
 					arg := branch.Argument
 					if value, err := arg.Parse(c.scan); err == nil {
 						c.Path = append(c.Path, &Path{