Add a macro kfill! (#897) #1624

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - push	7m 27s
Julia 1.6 - macos-latest - x64 - push	7m 32s
Julia 1.6 - windows-latest - x64 - push	15m 16s
Julia 1 - ubuntu-latest - x64 - push	14m 3s
Julia 1 - macos-latest - x64 - push	13m 3s
Julia 1 - windows-latest - x64 - push	14m 25s
Julia 1 - macos-latest - arm64 - push	7m 45s
Julia nightly - ubuntu-latest - x64 - push	12m 36s
Julia nightly - macos-latest - x64 - push	11m 24s
Julia nightly - windows-latest - x64 - push	13m 4s
	1h 56m 35s

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