Commits on Nov 16, 2021

1. Add #to_d support to BigDecimalWithNumericArgument …

   The [`bigdecimal/util`](https://github.com/ruby/bigdecimal/blob/v3.0.2/lib/bigdecimal/util.rb)
   library adds `#to_d` to several numeric types, where
   
   ```ruby
   numeric.to_d(*args)
   ```
   
   is equivalent to
   
   ```ruby
   BigDecimal(numeric, *args)
   ```
   
   and the performance improvement of `BigDecimalWithNumericArgument`
   therefore equally applies here.
   
   Also, the exception of `Float` with specified precision does not seem
   to make sense and is therefore dropped:
   
   ```
   Warming up --------------------------------------
      BigDecimal("1.2")   266.340k i/100ms
   BigDecimal("1.2", 9)   261.542k i/100ms
     BigDecimal(1.2, 9)    44.366k i/100ms
               1.2.to_d    42.809k i/100ms
            1.2.to_d(9)    43.915k i/100ms
   Calculating -------------------------------------
      BigDecimal("1.2")      2.634M (± 1.8%) i/s -     13.317M in   5.056712s
   BigDecimal("1.2", 9)      2.510M (± 5.4%) i/s -     12.554M in   5.016970s
     BigDecimal(1.2, 9)    330.664k (±32.5%) i/s -      1.464M in   5.055963s
               1.2.to_d    183.891k (± 7.3%) i/s -    941.798k in   5.148850s
            1.2.to_d(9)    189.455k (± 9.4%) i/s -    966.130k in   5.149545s
   ```
   
   Generated with:
   
   ```ruby
   require 'bigdecimal'
   require 'bigdecimal/util'
   require 'benchmark/ips'
   
   numeric = 1.2
   string = numeric.to_s
   prec = rand(7..11)
   
   Benchmark.ips do |ips|
     ips.report("BigDecimal(\"#{string}\")") { BigDecimal(string) }
     ips.report("BigDecimal(\"#{string}\", #{prec})") { BigDecimal(string, prec) }
     ips.report("BigDecimal(#{numeric}, #{prec})") { BigDecimal(numeric, prec) }
     ips.report("#{numeric}.to_d") { numeric.to_d  }
     ips.report("#{numeric}.to_d(#{prec})") { numeric.to_d(prec) }
   end
   ```

   

   leoarnold committed Nov 16, 2021
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