diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index e63058fb60..8cc38019ee 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -545,11 +545,11 @@ function comments_link( $deprecated = '', $deprecated_2 = '' ) {
  * @return int The number of comments a post has
  */
 function get_comments_number( $post_id = 0 ) {
+	$post_id = absint( $post_id );
+
 	if ( !$post_id )
 		$post_id = get_the_ID();
 
-	$post_id = absint($post_id);
-
 	$post = get_post($post_id);
 	if ( ! isset($post->comment_count) )
 		$count = 0;
diff --git a/wp-includes/link-template.php b/wp-includes/link-template.php
index d1f2413d0e..c0dffbd42c 100644
--- a/wp-includes/link-template.php
+++ b/wp-includes/link-template.php
@@ -461,13 +461,13 @@ function get_feed_link($feed = '') {
  * @param string $feed Optional. Feed type.
  * @return string
  */
-function get_post_comments_feed_link($post_id = '', $feed = '') {
-	if ( !$post_id )
+function get_post_comments_feed_link($post_id = 0, $feed = '') {
+	$post_id = absint( $post_id );
+
+	if ( ! $post_id )
 		$post_id = get_the_ID();
 
-	$post_id = absint($post_id);
-
-	if ( empty($feed) )
+	if ( empty( $feed ) )
 		$feed = get_default_feed();
 
 	if ( '' != get_option('permalink_structure') ) {
diff --git a/wp-includes/post.php b/wp-includes/post.php
index b9ca5b6f77..cab70ced0b 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -1267,16 +1267,16 @@ function delete_post_meta_by_key($post_meta_key) {
  * @param int $post_id post ID
  * @return array
  */
-function get_post_custom($post_id = 0) {
-	if ( !$post_id )
+function get_post_custom( $post_id = 0 ) {
+	$post_id = absint( $post_id );
+
+	if ( ! $post_id )
 		$post_id = get_the_ID();
 
-	$post_id = (int) $post_id;
+	if ( ! wp_cache_get( $post_id, 'post_meta' ) )
+		update_postmeta_cache( $post_id );
 
-	if ( ! wp_cache_get($post_id, 'post_meta') )
-		update_postmeta_cache($post_id);
-
-	return wp_cache_get($post_id, 'post_meta');
+	return wp_cache_get( $post_id, 'post_meta' );
 }
 
 /**
@@ -1333,18 +1333,18 @@ function get_post_custom_values( $key = '', $post_id = 0 ) {
  * @param int $post_id Optional. Post ID.
  * @return bool Whether post is sticky.
  */
-function is_sticky($post_id = null) {
-	if ( !$post_id )
+function is_sticky( $post_id = 0 ) {
+	$post_id = absint( $post_id );
+
+	if ( ! $post_id )
 		$post_id = get_the_ID();
 
-	$post_id = absint($post_id);
+	$stickies = get_option( 'sticky_posts' );
 
-	$stickies = get_option('sticky_posts');
-
-	if ( !is_array($stickies) )
+	if ( ! is_array( $stickies ) )
 		return false;
 
-	if ( in_array($post_id, $stickies) )
+	if ( in_array( $post_id, $stickies ) )
 		return true;
 
 	return false;