cast offset to intptr_t to avoid overflow #235

Job	Run time
Prepare the run	6s
alpine-linux-x64	0s
linux-x64-hs-zero / build (debug)	1m 27s
linux-x64 / build (debug)	1m 27s
docs / build (debug)	1m 28s
linux-x64 / build (release)	1m 27s
linux-cross-compile / build (aarch64)	1m 14s
linux-cross-compile / build (arm)	1m 26s
linux-x64-hs-minimal / build (debug)	1m 27s
linux-x64-hs-nopch / build (debug)	1m 27s
linux-cross-compile / build (s390x)	1m 21s
linux-cross-compile / build (ppc64le)	1m 27s
linux-x64-hs-optimized / build (debug)	1m 15s
linux-cross-compile / build (riscv64)	1m 27s
macos-aarch64 / build (debug)	1m 30s
macos-x64 / build (debug)	1m 19s
macos-x64 / build (release)	1m 17s
windows-aarch64 / build (debug)	1m 12s
macos-aarch64 / build (release)	1m 30s
windows-aarch64 / build (release)	1m 11s
windows-x64 / build (debug)	1m 12s
windows-x64 / build (release)	1m 11s
windows-x64	1s
macos-x64	1s
linux-x64	1s
macos-aarch64	1s
	27m 25s

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