module ActiveModel::Type::Helpers::Numeric

def cast(value)
  # Checks whether the value is numeric. Spaceship operator
  # will return nil if value is not numeric.
  value = if value <=> 0
    value
  else
    case value
    when true then 1
    when false then 0
    else value.presence
    end
  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)) &&
    !equal_nan?(old_value, new_value_before_type_cast)
end

def equal_nan?(old_value, new_value)
  (old_value.is_a?(::Float) || old_value.is_a?(BigDecimal)) &&
    old_value.nan? &&
    old_value.instance_of?(new_value.class) &&
    new_value.nan?
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.
  !NUMERIC_REGEX.match?(value)
end

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

def serialize(value)
  cast(value)
end