Fixup and test emp::Fraction #1127

Job	Run time
Web Tests	5m 44s
Test Tidy Enforcement on macOS	2m 14s
Enforce Tidyness	1m 10s
Tests (clang++, test-native-regular)	26m 58s
Tests (clang++, test-native-fulldebug)	28m 11s
Build Docker Image	9m 23s
Tests (clang++, test-native-opt)	47m 13s
Measure Test Coverage	32m 38s
Tests (clang++, test-examples)	9m 9s
Tests (clang++, test-demos)	2m 46s
Tests (g++, test-native-regular)	35m 52s
Tests (g++, test-native-fulldebug)	37m 10s
Tests (g++, test-native-opt)	51m 42s
Tests (g++, test-examples)	9m 19s
Tests (g++, test-demos)	3m 5s
Test Documentation Build	12m 31s
Deploy Documentation Coverage	0s
Deploy to DockerHub and ghcr.io	0s
	5h 15m 5s

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