Add information to Float #51
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The current reference manual does not clearly show that Float() can take hexadecimalfloating point format as an argument. According to https://github.com/ruby/ruby/tree/v1_9_2_381, Float() has supported hexadecimal floating point format since Ruby 1.9.2. The reference manual of 1.9.2 and later versions will show the exmaple with an argument of hexadecimal floating format.
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The current reference manual does not clearly say that Float() can take a hexadecimal number as an argument.
According to https://github.com/ruby/ruby/tree/v1_9_2_381, Float() has supported hexadecimal floating point format since Ruby 1.9.2.