Tidy up the round functionality (#4)
* Clean up the round functionality * Add int64_round() and switch double_round() to use it to work correctly for large FP values * Remove some dead code that is using the round functionality
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* Clean up the round functionality * Add int64_round() and switch double_round() to use it to work correctly for large FP values * Remove some dead code that is using the round functionality
mentioned in commit 66b436b4
·mentioned in commit 66b436b4