Add missing head, head(n), and first methods for TypedDatasets.#230

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imarios merged 3 commits intotypelevel:masterfrom

imarios:add_head

Jan 27, 2018

Commits on Jan 23, 2018

Add missing head, head(n), and first methods for TypedDatasets.
imarios
committed
Making head, head(n) aliases for headOption and take(n). Adding deprecation for head, first for familiarity.
imarios
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Commits on Jan 24, 2018

Allowing vanilla head/first with deprecation warnings.
imarios
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