Money.new/2 does accept a float - and perhaps it should not. It accepts an integer, Decimal and String as well which are clearly preferable. It converts to a Decimal at the interface. The inspect output you reference above is just that. In #Money<:USD, 200.012356> the 200.012356 is not a float, its a Decimal.
So the only place a float gets in the picture is at the factory interface new/2. There is no internally usage of a float whatsoever. Even to the extent I had to build my Decimal math lib to support basic finance calculations.
Definitely open to community views on disallowing floats even at the factory interface.
A coda to the above: One reason that floats are supported in Money.new/2 is that services, like OpenExchangeRates, return data in json format which the Elixir decoders will understandably reduce to a float when given the following:
rates: {
AED: 3.672538,
AFN: 66.809999,
ALL: 125.716501,
AMD: 484.902502,
ANG: 1.788575,
AOA: 135.295998,
ARS: 9.750101,
AUD: 1.390866,
/* ... */
}
So removing float support at in new/2 would create some challenges with the exisiting services that deliver floats. Not insurmountable, but not helpful either.
