(i.e., with a decimal point somewhere) GHC does not check that these
are out of range (e.g., for a `Float'), and bad things will inevitably
follow. To be corrected.
This problem does not exist for integral constants.
For very large/small fractional constants near the limits of your
floating-point precision, things may go wrong. (It's better than it
used to be.) Please report any such bugs.
Unchecked arithmetic:
Arguably not an infelicity, but... Bear in mind that operations
on `Int', `Float', and `Double' numbers are unchecked
for overflow, underflow, and other sad occurrences.
Use `Integer', `Rational', etc., numeric types if this stuff keeps you
awake at night.
Multiply-defined array elements -- not checked:
This code fragment should elicit a fatal error, but it does not: