Add test file for the 'modf' routine in rakudo#742

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tbrowder wants to merge 2 commits intoRaku:masterfrom tbrowder:modf

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Commits on Jun 27, 2021

Add test file for the 'modf' routine in rakudo
tbrowder
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Commits on Jul 4, 2021

commit all changes prior to closing branch 'modf', roast PR Raku#742
tbrowder
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