Decouple `rand` and `eltype` #1413

Job	Run time
Documentation	2m 10s
Julia 1.3 - ubuntu-latest - pull_request	23m 21s
Julia 1.3 - macos-latest - pull_request	25m 20s
Julia 1.3 - windows-latest - pull_request	43m 17s
Julia 1 - ubuntu-latest - pull_request	20m 28s
Julia 1 - macos-latest - pull_request	12m 0s
Julia 1 - windows-latest - pull_request	34m 36s
Julia pre - ubuntu-latest - pull_request	25m 14s
Julia pre - macos-latest - pull_request	15m 19s
Julia pre - windows-latest - pull_request	33m 14s
	3h 54m 59s

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