Index: src/wp-includes/taxonomy-functions.php
===================================================================
--- src/wp-includes/taxonomy-functions.php	(revision 35021)
+++ src/wp-includes/taxonomy-functions.php	(working copy)
@@ -920,20 +920,20 @@
 /**
  * Get sanitized Term field.
  *
- * Does checks for $term, based on the $taxonomy. The function is for contextual
- * reasons and for simplicity of usage. See sanitize_term_field() for more
- * information.
+ * The function is for contextual reasons and for simplicity of usage.
  *
  * @since 2.3.0
+ * @since 4.4.0 The `$taxonomy` parameter was made optional. `$term` can also now accept a WP_Term object.
  *
+ * @see sanitize_term_field()
+ *
  * @param string $field    Term field to fetch.
- * @param int    $term     Term ID.
- * @param string $taxonomy Taxonomy Name.
+ * @param int|WP_Term $term     Term ID or object.
+ * @param string $taxonomy Optional. Taxonomy Name. Default empty.
  * @param string $context  Optional, default is display. Look at sanitize_term_field() for available options.
  * @return string|int|null|WP_Error Will return an empty string if $term is not an object or if $field is not set in $term.
  */
-function get_term_field( $field, $term, $taxonomy, $context = 'display' ) {
-	$term = (int) $term;
+function get_term_field( $field, $term, $taxonomy = '', $context = 'display' ) {
 	$term = get_term( $term, $taxonomy );
 	if ( is_wp_error($term) )
 		return $term;
@@ -944,7 +944,7 @@
 	if ( !isset($term->$field) )
 		return '';
 
-	return sanitize_term_field($field, $term->$field, $term->term_id, $taxonomy, $context);
+	return sanitize_term_field( $field, $term->$field, $term->term_id, $term->taxonomy, $context );
 }
 
 /**
Index: tests/phpunit/tests/term/getTermField.php
===================================================================
--- tests/phpunit/tests/term/getTermField.php	(revision 0)
+++ tests/phpunit/tests/term/getTermField.php	(working copy)
@@ -0,0 +1,83 @@
+<?php
+
+/**
+ * @group taxonomy
+ */
+class Tests_Term_getTermField extends WP_UnitTestCase {
+
+	public $taxonomy = 'wptests_tax';
+
+	function setUp() {
+		parent::setUp();
+
+		register_taxonomy( $this->taxonomy, 'post' );
+	}
+
+	/**
+	 * @ticket 34245
+	 */
+	public function test_get_term_field_should_not_return_error_for_empty_taxonomy() {
+		$term = $this->factory->term->create_and_get( array( 'taxonomy' => $this->taxonomy ) );
+
+		$found = get_term_field( 'taxonomy', $term->term_id, '' );
+		$this->assertNotWPError( $found );
+		$this->assertSame( $this->taxonomy, $found );
+	}
+
+	/**
+	 * @ticket 34245
+	 */
+	public function test_get_term_field_supplying_a_taxonomy() {
+		$term = $this->factory->term->create_and_get( array( 'taxonomy' => $this->taxonomy ) );
+
+		$found = get_term_field( 'taxonomy', $term->term_id, $term->taxonomy );
+		$this->assertSame( $this->taxonomy, $found );
+	}
+
+	/**
+	 * @ticket 34245
+	 */
+	public function test_get_term_field_supplying_no_taxonomy() {
+		$term = $this->factory->term->create_and_get( array( 'taxonomy' => $this->taxonomy ) );
+
+		$found = get_term_field( 'taxonomy', $term->term_id );
+		$this->assertSame( $this->taxonomy, $found );
+	}
+
+	/**
+	 * @ticket 34245
+	 */
+	public function test_get_term_field_should_accept_a_WP_Term_object_or_a_term_id() {
+		$term = $this->factory->term->create_and_get( array( 'taxonomy' => $this->taxonomy ) );
+
+		$this->assertInstanceOf( 'WP_Term', $term );
+		$this->assertSame( $term->term_id, get_term_field( 'term_id', $term ) );
+		$this->assertSame( $term->term_id, get_term_field( 'term_id', $term->term_id ) );
+	}
+
+	/**
+	 * @ticket 34245
+	 */
+	public function test_get_term_field_invalid_taxonomy_should_return_WP_Error() {
+		$term = $this->factory->term->create_and_get( array( 'taxonomy' => $this->taxonomy ) );
+
+		$found = get_term_field( 'taxonomy', $term, 'foo-taxonomy' );
+		$this->assertWPError( $found );
+		$this->assertSame( 'invalid_taxonomy', $found->get_error_code() );
+	}
+
+	/**
+	 * @ticket 34245
+	 */
+	public function test_get_term_field_invalid_term_should_return_WP_Error() {
+		$found = get_term_field( 'taxonomy', 0, $this->taxonomy );
+
+		$this->assertWPError( $found );
+		$this->assertSame( 'invalid_term', $found->get_error_code() );
+
+		$_found = get_term_field( 'taxonomy', 0 );
+
+		$this->assertWPError( $_found );
+		$this->assertSame( 'invalid_term', $_found->get_error_code() );
+	}
+}