Storing false values in fields of Array and Hash types fails but not in an expected way

class Person

  include Mongoid::Document

  field :map, type: Hash

end

person = Person.new

person.map = false

Expected behavior:

A Mongoid::Errors::InvalidValue error is raised.

Actual behavior:
A NoMethodError: undefined method `update_values' for false:FalseClass error is raised.