Fast, lightweight xlsx parser for Ruby that provides nothing a CSV parser wouldn't

Xsv is a fast, lightweight, pure Ruby parser for Office Open XML spreadsheet files (commonly known as Excel or .xlsx files). It strives to be minimal in the sense that it provides nothing a CSV reader wouldn't, meaning it only deals with minimal formatting and cannot create or modify documents.Xsv is designed for worksheets with a single table of data, optionally with a header row. It only casts values to basic Ruby types (integer, float, date and time) and does not deal with most formatting or more advanced functionality. It strives for fast processing of large worksheets with minimal RAM and CPU consumption and has been in production use since the earliest versions.Xsv stands for 'Excel Separated Values', because Excel just gets in the way.