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- New rubinius tag format proposal
- 00 - ref
- x1 - fixnum (only 1 bit used, leaving 31 bits for signed value)
- 10 - literal / symbol
- bit patterns for important literals and values:
- 00000000 - non-literal value nil
- 00000010 - false
- 00000110 - true
- 00001010 - undef
- xxxx1110 - symbols
- which means the only two values with every value other than the secondmost least significant bit cleared are nil and false
- #define RTEST(val) (val & 0xfffffffd)
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