build: drop internal issues from list of closed issues

Author: Planeshifter

lib/node_modules/@stdlib/_tools/changelog/generate/lib/closed_issues.js

@@ -20,6 +20,8 @@
 
 // MODULES //
 
+var contains = require( '@stdlib/assert/contains' );
+var isDigitString = require( '@stdlib/assert/is-digit-string' );
 var filter = require( '@stdlib/array/base/filter' );
 var map = require( '@stdlib/utils/map' );
 var collectField = require( './collect_field.js' );
@@ -28,6 +30,11 @@ var sectionEnd = require( './section_end.js' );
 var heading = require( './heading.js' );
 
 
+// VARIABLES //
+
+var VERBS = [ 'Closes', 'Fixes', 'Resolves' ];
+
+
 // FUNCTIONS //
 
 /**
@@ -38,7 +45,7 @@ var heading = require( './heading.js' );
 * @returns {boolean} boolean indicating whether a mention references closing an issue
 */
 function isClosingIssue( mention ) {
-	return mention.action === 'Closes' || mention.action === 'Fixes' || mention.action === 'Resolves';
+	return contains( VERBS, mention.action ) && isDigitString( mention.ref );
 }
 
 /**