[FIX] Throw field errors when failing to coerce Int/Float. #444
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As illustrated by #391, when a value is provided for a field of type Int which cannot be represented by Int (e.g. a 64bit value is provided to the 32bit Int type), then the spec claims a field-error should be raised however currently
null
is returned directly instead.Spec: https://facebook.github.io/graphql/#sec-Int
This updates to throw meaningful error messages when invalid Int and Float values cannot be coerced without losing information.