The class for fixed-length integers that fit into the machine's pointer, which is usually 31 bits long. If the result of an operation is out of Fixnum range, it is automatically extended into a Bignum.
Returns the string corresponding to a Symbol integer (obtained with Symbol#to_i). If there is no symbol that corresponds to the integer, returns nil.
Returns the Symbol object corresponding to the integer value of the object's self. If there is no symbol that corresponds to the integer, returns nil.
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