fsxc: refactoring to avoid unnecessary tuple #1923

Job	Run time
linux-newLTS-github--dotnet-and-msbuild	6m 15s
linux-newLTS-github--dotnet-and-xbuild	6m 30s
linux-newLTS-vanilla--newmono	5m 36s
linux-newLTS-vanilla--dotnet6	6m 43s
linux-newLTS-vanilla--stockmono	4m 10s
linux-oldLTS-github--dotnet-and-msbuild	6m 3s
linux-oldLTS-github--dotnet-and-xbuild	5m 58s
linux-oldLTS-vanilla--newmono	5m 42s
linux-oldLTS-vanilla--stockmono	4m 34s
macOS--dotnet6-and-mono	6m 32s
macOS--mono	5m 53s
windows--dotnet6	7m 35s
windows--legacyFramework	5m 46s
sanity-check	1m 1s
publish	59s
	1h 19m 17s

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