Return an enumerator when calling each_row_streaming without a block #224
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Similar to PR #219 ("Return an enumerator when calling '#each' without a block"), this pull request allows Roo::Excelx#each_row_streaming to return an Enumerator when it's called without a block.
This can be helpful when streaming in very large spreadsheets in batches/slices (e.g. for bulk SQL queries), like this: