Support for the Ruby 2.4 series has ended. See here for reference.
Numeric
BigDecimal extends the native Integer class to provide the to_d method.
When you require the BigDecimal library in your application, this method will be available on Integer objects.
Convert int to a BigDecimal and return it.
require 'bigdecimal' require 'bigdecimal/util' 42.to_d # => 0.42e2
# File bigdecimal/lib/bigdecimal/util.rb, line 18
def to_d
BigDecimal(self)
end