TYPO3 Core

If a record that is copied has TCA.TABLE.ctrl.prependAtCopy, and the label of that table (i.e., $headerField) is an integer, it triggers an infinite call of getCopyHeader() (DataHandler:3704).

The prepend string, added with a space, appears as follows: "2077 (copy 1)".
Within getCopyHeader():8944, an equality comparison is made with the integer field but as a string.
In my case, MariaDB reports error 1292: Truncated incorrect value, though the query returns 1.
What occurs is that the database truncates the value at the space to 2077 and processes it as such, which invariably returns 1.

Solution: The condition in copyRecord():3700 should be extended to include a string check.