Numeric instances for Convertible.
Copyright (C) 2009 John Goerzen email@example.com
All rights reserved.
For license and copyright information, see the file COPYRIGHT
These instances perform conversion between numeric types such as Double, Int, Integer, Rational, and the like. Here are some notes about the conversion process:
Conversions from floating-point types such as Double to integral types are dune via the truncate function. This is a somewhat arbitrary decision; if you need different behavior, you will have to write your own instance or manually perform the conversion.
All conversions perform bounds checking. If a value is too large for its destination type, you will get a ConvertError informing you of this. Note that this behavior differs from functions in the Haskell standard libraries, which will perform the conversion without error, but give you garbage in the end.
Conversions do not perform precision checking; loss of precision is implied with certain conversions (for instance, Double to Float) and this is not an error.
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