Text (and Data.Text.Lazy) is encoded as a byte aligned array of bytes corresponding to its UTF8 encoding.

>>> tt $ T.pack ""
(True,[1,0])

>>> tt $ T.pack "aaa"
(True,[1,3,97,97,97,0])

>>> tt $ T.pack "¢¢¢"
(True,[1,6,194,162,194,162,194,162,0])

>>> tt $ T.pack "日日日"
(True,[1,9,230,151,165,230,151,165,230,151,165,0])

>>> tt $ T.pack "𐍈𐍈𐍈"
(True,[1,12,240,144,141,136,240,144,141,136,240,144,141,136,0])

Strict and Lazy Text have the same encoding:

>>> tst (T.pack "abc") == tst (TL.pack "abc")
True