ADD_MONTHS with a non-integer argument gives a different result on Oracle compared to MariaDB

SELECT ADD_MONTHS('1994-07-07', 2);

+-----------------------------+

| ADD_MONTHS('1994-07-07', 2) |

+-----------------------------+

| 1994-09-07                  |

+-----------------------------+

SELECT ADD_MONTHS('1994-07-07', 2.6);

+-------------------------------+

| ADD_MONTHS('1994-07-07', 2.6) |

+-------------------------------+

| 1994-10-07                    |

+-------------------------------+

SELECT ADD_MONTHS('07-JUL-1994',2) FROM DUAL

ADD_MONTHS('07-JUL-1994',2.6)

07-SEP-94

SELECT ADD_MONTHS('07-JUL-1994',2.6) FROM DUAL	

ADD_MONTHS('07-JUL-1994',2)

07-SEP-94