FLX-5003: value on the fixed-point grid is not exact
Family: numerics (the 5000 band)
The grid accepts int, decimal.Decimal and fractions.Fraction only. A float, a non-finite Decimal, or any other class would make the encoded value depend on the platform's binary rounding, which is the one thing the grid exists to remove.
Look it up offline
$ fluxsim explain FLX-5003
Every code is listed in the error index.