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moodle/question/type/numerical
Tim Hunt ff43c30f0a MDL-31837 numerical tolerance: better handling of very small tolerances.
The changes between Moodle 1.9 and 2.1 made the marking of very small
answers like 10^-20 almost impossible. This change fixes it.

This fix is almost entirely due the the careful research of Pierre
Pichet, who carefully testing various proposals, and worked out that
this one seemed best.
2012-08-23 18:59:15 +01:00
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