module Hashie::Extensions::Coercion::InstanceMethods

def coerce_or_init(type)
  type.respond_to?(:coerce) ? ->(v) { type.coerce(v) } : ->(v) { type.new(v) }
end

def custom_writer(key, value, _convert = true)
  self[key] = value
end

def replace(other_hash)
  (keys - other_hash.keys).each { |key| delete(key) }
  other_hash.each { |key, value| self[key] = value }
  self
end

def set_value_with_coercion(key, value)
  into = self.class.key_coercion(key) || self.class.value_coercion(value)
  return set_value_without_coercion(key, value) unless value && into
  return set_value_without_coercion(key, coerce_or_init(into).call(value)) unless into.is_a?(Enumerable)
  if into.class >= Hash
    key_coerce = coerce_or_init(into.flatten[0])
    value_coerce = coerce_or_init(into.flatten[-1])
    value = Hash[value.map { |k, v| [key_coerce.call(k), value_coerce.call(v)] }]
  else # Enumerable but not Hash: Array, Set
    value_coerce = coerce_or_init(into.first)
    value = into.class.new(value.map { |v| value_coerce.call(v) })
  end
  set_value_without_coercion(key, value)
end