Either type provides is used to represent values that can be one of two possibilities. For example,
Either Int Number can be used in a place where either integers or floating point numbers are acceptable.
A common use for this type is error handling, where by convention the
Left constructor carries error messages and the
Right constructor carries expected values (“
Right is right”). This convention is used as the
Monad, etc. instances all operate on the
Right part of the
spago install either
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