haskell - Why is there no typeclass for container-types? -


i found out containers have similar function set. list, set, sequence, text , bytestrings example. wonder why don't use 1 or more common typeclasses.

actually there are, see question making single function work on lists, bytestrings , texts (and perhaps other similar representations), duplicate of yours.

the main reason being in separate package needs language extension - either functional dependencies or type families. have somehow text can contain chars, bytestring can contain word8s, [] can contain type, , set can contain instances of ord.


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