module ActiveModel::Type::Helpers::Numeric

def cast(value)
  value = \
    case value
    when true then 1
    when false then 0
    when ::String then value.presence
    else value
    end
  super(value)
end

def changed?(old_value, _new_value, new_value_before_type_cast) # :nodoc:
  super || number_to_non_number?(old_value, new_value_before_type_cast)
end

def non_numeric_string?(value)
  # 'wibble'.to_i will give zero, we want to make sure
  # that we aren't marking int zero to string zero as
  # changed.
  value.to_s !~ /\A-?\d+\.?\d*\z/
end

def number_to_non_number?(old_value, new_value_before_type_cast)
  old_value != nil && non_numeric_string?(new_value_before_type_cast)
end