Strange lua 5.3 tonumber() behaviour
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- Subject: Strange lua 5.3 tonumber() behaviour
- From: Daurnimator <quae@...>
- Date: 2015年8月19日 13:34:25 +1000
Lua 5.3 doesn't seem to accept fractional components when passing a base
$ lua5.1 -e 'print(tonumber("9.0", 10))'
9
$ lua5.3 -e 'print(tonumber("9.0", 10))'
nil
$ lua5.3 -e 'print(tonumber("9.0"))'
9.0
Lua 5.3 performs overflow/wraparound on large numbers... but only with
limited precision.
$ lua5.1 -e 'print(tonumber("99999999999999999999999999999999999999999999999999999999999999999999999999999999"))'
1e+80
$ lua5.3 -e 'print(tonumber("99999999999999999999999999999999999999999999999999999999999999999999999999999999"))'
-1
$ lua5.1 -e 'print(tonumber("999999999999999999999999999"))'
1e+27
$ lua -e 'print(tonumber("999999999999999999999999999"))'
-6930898827444486145
Are these behaviours intentional?
Should these changes from 5.1/5.2 be documented?