* Fix the GHCJS build by not using `double-conversion`, as it relies on a native C library which obviously isn't available in GHCJS (it is still used in native builds).
* Removed direct dependency on integer-gmp, instead using very similar code from the `text` package. This changed the implementation of `build` for `Integer`, which results in better performance in some cases, and no performance degradation. See the benchmarking reports in bench/reports for more details.
* formatting now compiles on GHCJS (due to the change above).
* Added some benchmarking, starting based on code from the `string-interpolate` package.
* Added INLINE pragmas to many very short functions. Results in better performance in the benchmarks.
