[Haskell-cafe] Coercible between data A a b = A a b and (a, b)

Greetings! Is there any reason behind/what is the reason behind ``` data A a b = A a b ``` and ``` (a, b) ``` not being coercible? And in general all n-ary constructors not being coercible to one another? Thanks in advance! ======= Georgi