Exploring Ruby CSV standard library default handling of empty cell values

csv_opt.txt

2.6.3 :001 > require 'csv'
 => true
2.6.3 :002 > csv = CSV.parse(File.read('required_field_empty.csv'), headers: true)
 => #<CSV::Table mode:col_or_row row_count:4>
2.6.3 :003 > rows = []
 => []
2.6.3 :004 > csv.each{ |r| rows << r.to_h }
 => #<CSV::Table mode:col_or_row row_count:4>
2.6.3 :024 > rows[1]['objectNumber']
 => nil
 
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 2.6.3 :030 > rows = []
 => []
2.6.3 :031 > csv = CSV.parse(File.read('required_field_empty.csv'), headers: true, nil_value: '')
 => #<CSV::Table mode:col_or_row row_count:4>
2.6.3 :032 > csv.each{ |r| rows << r.to_h }
 => #<CSV::Table mode:col_or_row row_count:4>
2.6.3 :033 > rows[1]['objectNumber']
 => ""