% Copyright (c) 2014 Jihyun Yu <yjh0502@gmail.com>
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-type spec_typedesc() :: {atom(), spec_typedesc_type() | {type, spec_typedesc_type()}}.
-type spec_typedesc_type() :: int | binary |
    {list, spec_typedesc()} |
    {dict, spec_typedesc(), spec_typedesc()}.

-type spec_constraint_key() :: gt | gte | le | lte.
-type spec_constraint() :: {spec_constraint_key(), any()}.

-type specs() :: #{atom() => [spec()] | spec_typedesc()}.
-type spec() :: spec_typedesc() | spec_constraint().