Decouple `rand` and `eltype` #1434

Job	Run time
Documentation	2m 37s
Julia 1.3 - ubuntu-latest - pull_request	52m 53s
Julia 1.3 - macos-latest - pull_request	1h 2m 33s
Julia 1.3 - windows-latest - pull_request	47m 39s
Julia 1 - ubuntu-latest - pull_request	1h 0m 58s
Julia 1 - macos-latest - pull_request	58m 52s
Julia 1 - windows-latest - pull_request	1h 34m 40s
Julia pre - ubuntu-latest - pull_request	59m 54s
Julia pre - macos-latest - pull_request	1h 6m 58s
Julia pre - windows-latest - pull_request	1h 29m 39s
	9h 56m 43s

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