Implement `into_model` #61

Job	Run time
Docs - stable toolchain (recent)	23s
Test - stable toolchain (minimal)	23s
Prepare	2s
Test - stable toolchain (recent)	27s
Integration tests - stable toolchain (26_0)	1m 25s
Integration tests - stable toolchain (25_2)	1m 25s
Integration tests - stable toolchain (25_1)	1m 41s
Integration tests - stable toolchain (25_0)	1m 41s
Integration tests - stable toolchain (24_2)	1m 0s
Integration tests - stable toolchain (24_1)	1m 44s
Integration tests - stable toolchain (24_0_1)	48s
Integration tests - stable toolchain (23_2)	1m 44s
Integration tests - stable toolchain (23_1)	1m 22s
Integration tests - stable toolchain (23_0)	1m 44s
Integration tests - stable toolchain (22_1)	49s
Integration tests - stable toolchain (22_0)	1m 5s
Integration tests - stable toolchain (0_21_2)	53s
Integration tests - stable toolchain (0_20_2)	1m 34s
Integration tests - stable toolchain (0_19_1)	54s
Integration tests - stable toolchain (0_18_1)	58s
Integration tests - stable toolchain (0_17_1)	1m 34s
Lint - nightly toolchain (recent)	30s
Test - nightly toolchain (minimal)	34s
Docs - nightly toolchain (recent)	48s
Test - nightly toolchain (recent)	38s
	26m 6s

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