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fold

switch.fold

(C 
type
, fa Unary C A, fb Unary C B)
 => 
C
fold this choice to new type `C`.

this is useful when you don't want to break
fluent-style code.

example:

Type Parameters

0.098dev (GIT hash b44352b4c68decbc58a097b291a1c8f3a5a05486)
last changed: 2026-07-03