style: Add type hints

Author: danmichaelo

src/BibliographicRecord.php

@@ -2,6 +2,7 @@
 
 namespace Scriptotek\Marc;
 
+use Scriptotek\Marc\Exceptions\UnknownRecordType;
 use Scriptotek\Marc\Fields\Isbn;
 use Scriptotek\Marc\Fields\Subject;
 use Scriptotek\Marc\Fields\SubjectInterface;
@@ -15,6 +16,10 @@ class BibliographicRecord extends Record
      * Marc21::ISBD_PUNCTUATION_INCLUDED, Marc21::NON_ISBD_PUNCTUATION_OMITTED
      * or Marc21::UNKNOWN_CATALOGING_FORM.
      *
+     * @property Isbn[] isbns
+     * @property string title
+     * @property SubjectInterface[] subjects
+     *
      * @return string
      * @throws UnknownRecordType
      */

src/Record.php

@@ -16,6 +16,9 @@
  * methods of File_MARC and File_MARCXML, which are hard-wired to call
  * `new File_MARC_Record()`. The down-side of the wrapping approach is that we
  * break static code analysis and IDE code hinting.
+ *
+ * @property string id
+ * @property string type
  */
 class Record
 {