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51d09e6a2a
In [1] a bug casting large multiprecision integers to floats is documented (note that it
received two fixes, the most recent and relevant is [2]). Even with the fix, boost now
returns NaN instead of ±∞ as it did before [3].
Since we cannot rely on boost, detect the conditions that trigger the bug and return
the expected result.
The unit test is extended to cover large negative numbers.
Boost version behavior:
- 1.78 - returns ±∞
- 1.79 - terminates
- 1.79 + fix - returns NaN
Fixes https://github.com/scylladb/scylladb/issues/18508
[1] https://github.com/boostorg/multiprecision/issues/553
[2] ea786494db
[3] https://github.com/boostorg/math/issues/1132
Closes scylladb/scylladb#18532