Decimal with many decimal places

Hi @charliekelly. The issue isn’t that Decimal is rounding, it’s that the float is rounding itself prior to being passed to the Decimal.new function:

iex(1)> 3.65975555555452921
3.659755555554529

Decimal.new with a string containing all of the desired characters works as expected;

iex(3)> Decimal.new("3.65975555555452921")
#Decimal<3.65975555555452921>

I suspect you may be on quite an old version of Decimal since Decimal.new/1 with a float is deprecated. For example:

iex> Decimal.new 12.345
warning: passing float to Decimal.new/1 is deprecated as floats have inherent inaccuracy. Use Decimal.from_float/1 or Decimal.cast/1 instead