# FakeDecimal

If you deal with legacy Erlang code, you may know the old `erlang_decimal`
library. On Hex it's published as `erlang_decimal`, but it registers its OTP
application (and its module) under the plain name `decimal` — the same name the
modern Elixir `decimal` library uses for its own OTP application. Since a BEAM
node can't run two applications with the same name, you can't depend on both at
once.

`fake_decimal` solves this by providing the exact same API as the old `decimal`
module, implemented on top of the modern Elixir `Decimal` library. Depend on
`fake_decimal` (which pulls in the real `decimal` app) instead of
`erlang_decimal`, and your legacy code can keep calling `:decimal.add/2`,
`:decimal.round/3`, and so on without ever knowing it's talking to the new
library underneath.

## Installation

Add `fake_decimal` to your list of dependencies in `mix.exs`:

```elixir
def deps do
  [
    {:fake_decimal, "~> 0.1.1"}
  ]
end
```

Documentation is available on [HexDocs](https://hexdocs.pm/fake_decimal).

Property-based tests compare `fake_decimal` against a real instance of
`erlang_decimal`, loaded in a separate node, to make sure the two behave
identically.

See the @moduledoc in `lib/fake_decimal.ex` for the full API and the handful of
intentional deviations from the original.