Function prettyPrintFailureError

Pretty prints errors with the rational that multiple errors can occur in an array, or an object.

A top level decoding error always starts with "$root" (not to be confused with a field called "root")

asString.decode(1)
// $root: expected string but got number
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An array can return multiple errors

asArray(asString).decode(["foo", 1, "bar", null])
// $root[1]: expected string but got number
// $root[3]: expected string but got null
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An object can return multiple errors

const decoder = asObject.withField(
     "foo",
     asArray(
         asObject.withField("bar", asString)
     )
)

decoder.decode({ foo: [ {bar: "buzz"}, {fizz: "foo"}, {bar: 2} ] })
// $root.foo[1].bar: expected string but got undefined
// $root.foo[2].bar: expected string but got number
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