Rounding Errors on Decimal fields

[siassaj]

A bit of strangeness, version 2.20.0

After creating an invoice via

xeroizer_invoice = @application.Invoice.find(id)
xeroizer_invoice.line_items = []
xeroizer_invoice.attributes = attributes
xeroizer_invoice.save!

We get some strange rounding errors:

xeroizer_invoice.sub_total
=> 0.9999e2

xeroizer_invoice.attributes[:sub_total]
=> 0.1e3

xeroizer_invoice.attributes[:sub_total] == xeroizer_invoice.sub_total
=> false

This has also happenend on other fields such as total.

Briefly, in model_definition_helper I found

define_simple_attribute(field_name, :decimal, options, 0.0)

This method looks to be setting up a getter method with on transformation.

define_method internal_field_name do 
  @attributes[field_name].nil? ? value_if_nil : @attributes[field_name]
end

Any ideas what's up?

EDIT: I looked at what calculated: true is doing but it doesn't look to be the problem...