Fixed AbstractAttributeMapper and typo in UnboundAttribute #741

Job	Run time
Prepare the run	6s
alpine-linux-x64	0s
linux-x64 / build (debug)	18m 57s
linux-x64 / build (release)	18m 57s
linux-x64-hs-nopch / build (debug)	18m 57s
linux-x64-hs-zero / build (debug)	12m 27s
linux-x86-hs / build (debug)	14m 54s
linux-x86-hs / build (release)	18m 56s
linux-cross-compile / build (aarch64)	18m 55s
linux-x64-hs-minimal / build (debug)	7m 28s
linux-x64-hs-optimized / build (debug)	17m 9s
linux-cross-compile / build (arm)	18m 44s
macos-x64 / build (debug)	18m 59s
linux-cross-compile / build (s390x)	18m 56s
macos-x64 / build (release)	18m 59s
linux-cross-compile / build (ppc64le)	18m 56s
docs / build (debug)	2m 34s
linux-cross-compile / build (riscv64)	18m 56s
macos-aarch64 / build (debug)	18m 54s
windows-aarch64 / build (debug)	18m 17s
macos-aarch64 / build (release)	17m 28s
windows-x64 / build (debug)	11m 13s
windows-x64 / build (release)	11m 16s
windows-aarch64 / build (release)	16m 46s
windows-x64	1s
macos-aarch64	1s
linux-x64	1s
macos-x64	1s
	5h 56m 48s

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