dblock / hyperclient / 33015365845

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Fix Resource#to_h returning nil instead of matching #to_hash

Resource#to_h/#to_hash were both delegated via method_missing to
_attributes, guarded by an `Array.method_defined?(method)` check
meant to prevent Enumerable-ish methods (each, map, count, etc.)
from being delegated. However, Array defines #to_h but not #to_hash,
so the guard let #to_hash through while silently swallowing #to_h
(method_missing's elsif branch simply falls through, returning nil).

Fix by explicitly defining #to_h (and aliasing #to_hash to it) on
Resource, delegating to _attributes.to_h, instead of relying on the
Array.method_defined? heuristic for this specific pair of methods.

Closes #103

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