"
Before this series scylla would effectively infinite loop when, for
example, casting a decimal with a negative scale to float.
Fixes#6720
"
* 'espindola/fix-decimal-issue' of https://github.com/espindola/scylla:
big_decimal: Add a test for a corner case
big_decimal: Correctly handle negative scales
big_decimal: Add a as_rational member function
big_decimal: Move constructors out of line
(cherry picked from commit 3e2eeec83a)
c5e2fad1c8