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Coerce empty string to nil for all Primitive types except String (#2067)

* Reorder PrimitiveCoercerSpec contexts to be alphabetical

* Coerce empty string to nil for all Primitive types except String

This matches the behavior in v1.2.5 with the exception of Symbol. In
v1.2.5 an empty string was coerced to an empty symbol (:''), now it is
coerced to nil.

* Add integration specs for empty string param coercion

These specs mirror the specs for nil params. Exceptions are made for
non-primitive types based on their current behavior.

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