[Shugart23]

Is there a preferred meaning of the double?

[mw64ahw]

My preferred meaning playing a version of Transfer Lebensohl is GI with 4♠ or 5♣ or both. With both I may be GF

Edit:: should have included 4s44 GF

[DavidKok]

Takeout.

[pescetom]

Takeout, playing Rubensohl

[P_Marlowe]

T/O

Keep it simple.

The hands that go via T/O are usually balanced,
if you have a long suit, or a 2-suited hand,
that does not want to defend, you will use a
lebensohl variant.
But to find a 4-4 and to get them from time to time,
you will use the good old T/O.

Obviouly, if your NT range is lower, than penalty may
get more attractive, but if your NT range goes down,
this that the expected strength for the responding hand
goes up.

[Huibertus]

Take out. Always, but even more so when playing weak NT.

[steve2005]

Takeout with a doubleton in bid suit so can be converted for penalties.