I have the following domain declared:

CREATE DOMAIN DOM_BOOLEAN
AS Varchar(3)
DEFAULT 'No'
NOT NULL
CHECK(VALUE IN ('No', 'Yes'))
COLLATE NONE;

Now look at the following output from FlameRobin

...
IS_MYL DOM_BOOLEAN DEFAULT 'No',
IS_RLP DOM_BOOLEAN DEFAULT 'No',
IS_ACV DOM_BOOLEAN DEFAULT T 'Yes',
IS_ATE DOM_BOOLEAN DEFAULT 'Yes',
...

In all fields that have a field "type" of this domain I get:

DOM_BOOLEAN

as expected, followed by the DEFAULT 'No' or 'Yes' as I had set it.
So what is going on with the third line? Where it says:

... DOM_BOOLEAN DEFAULT T 'Yes',

What is the "extra" letter "T" doing in there?
Should I get rid of this "T"? If so, how?

Thanks in advance.