Does "gpart delete" send TRIM (BIO_DELETE) for freed space?

[Lev Serebryakov]

 I want to cleanup and TRIM partition on my SSD (it was used for L2ARC,
not for any FS). Is it enough to call "gpart delete" or I need to send
"TRIM" request(s) manually?

 If I need to send TRIM manually, how can I do this?

-- 
// Lev Serebryakov