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Add support for 128 bit HashMap key serialization #2516

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Job	Run time
Clippy	0s
Fuzz	41s
Rust beta	24s
Documentation	16s
Rust 1.64.0	3m 7s
Minimal versions	13s
Rust 1.56.1	3m 2s
Miri (64-bit little endian)	3m 39s
Rust stable	32s
Miri (64-bit big endian)	4m 1s
Outdated	0s
Rust nightly	58s
Rust stable (windows)	1m 40s
Miri (32-bit little endian)	4m 11s
Rust nightly (windows)	2m 9s
Miri (32-bit big endian)	4m 7s
	29m 0s