val pair :
?eq:(('a * 'b) -> ('a * 'b) -> bool) ->
'a React.signal ->
'b React.signal ->
('a * 'b) React.signalval fst : ?eq:('a -> 'a -> bool) -> ('a * 'b) React.signal -> 'a React.signalval snd : ?eq:('a -> 'a -> bool) -> ('b * 'a) React.signal -> 'a React.signal