Error processing code with Style/ExtraSpacing

[rrosenblum]

This is happening in version 0.33.0 and master

Sample test

it 'exception' do
  source = ['{:a => "a",',
            ' :b => [nil,  2.5]}']

  inspect_source(cop, source)
end

Exception

RuboCop::Cop::Style::ExtraSpacing when AllowForAlignment is true exception
     Failure/Error: inspect_source(cop, source)
     NoMethodError:
       undefined method `[]' for 2.5:Float
     # ./lib/rubocop/cop/style/extra_spacing.rb:107:in `aligned_same_character?'
     # ./lib/rubocop/cop/style/extra_spacing.rb:82:in `block in aligned_with?'
     # ./lib/rubocop/cop/style/extra_spacing.rb:76:in `downto'
     # ./lib/rubocop/cop/style/extra_spacing.rb:76:in `each'
     # ./lib/rubocop/cop/style/extra_spacing.rb:76:in `aligned_with?'
     # ./lib/rubocop/cop/style/extra_spacing.rb:52:in `aligned_with_something?'
     # ./lib/rubocop/cop/style/extra_spacing.rb:28:in `block in investigate'
     # ./lib/rubocop/cop/style/extra_spacing.rb:24:in `each'
     # ./lib/rubocop/cop/style/extra_spacing.rb:24:in `each_cons'
     # ./lib/rubocop/cop/style/extra_spacing.rb:24:in `investigate'