Upstream changes:
2014-10-16, version 1.3.4
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Implementation changes
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* Fix input of huge floats.
Other changes
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* Support the AArch64 and the Mips64 ABIs.
2013-07-21, version 1.3.3
=========================
Implementation changes
----------------------
* Fix integer input of leading zeros in power-of-two base.
* Fix several floating-poing conversion bugs involving huge numbers.
* Fix bug that would set input stream fail state when reading a number at EOF.
Other changes
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* Support the x32 ABI.