Document caveats for encodeWith, fixes #15 #34

Job	Run time
emulated (s390x)	23m 10s
arm (arm32v7)	10m 10s
emulated (ppc64le)	19m 5s
darwin_arm (self-hosted, macOS, ARM64, 8.10.7)	26m 0s
arm (arm64v8)	8m 51s
build (ubuntu-latest, 8.6, 3.8.1.0)	10m 31s
build (ubuntu-latest, 8.8, 3.8.1.0)	11m 0s
darwin_arm (self-hosted, macOS, ARM64, 9.2.8)	20m 30s
freebsd (self-hosted, FreeBSD, X64, 9.4.8)	5m 58s
build (ubuntu-latest, 8.10, 3.8.1.0)	11m 37s
darwin_arm (self-hosted, macOS, ARM64, 9.4.7)	22m 35s
i386	9m 36s
freebsd (self-hosted, FreeBSD, X64, 9.6.4)	6m 6s
build (ubuntu-latest, 9.0, 3.8.1.0)	11m 10s
build (ubuntu-latest, 9.2, 3.8.1.0)	8m 28s
build (ubuntu-latest, 9.4, 3.8.1.0)	9m 0s
build (ubuntu-latest, 9.6, 3.8.1.0)	7m 43s
build (ubuntu-latest, 9.8, 3.8.1.0)	8m 53s
build (macOS-12, 9.4, 3.8.1.0)	3h 49m 41s
build (macOS-12, 9.6, 3.8.1.0)	48m 48s
build (windows-latest, 9.4, 3.8.1.0)	43m 29s
build (windows-latest, 9.6, 3.8.1.0)	49m 56s
	10h 2m 17s

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