````
[t27duck@mobi-lappy mobi]$ rails c
Loading development environment (Rails 4.0.2)
irb(main):001:0> require "zero_fill"
=> true
irb(main):002:0> myDates = {
irb(main):003:1* Date.parse("2013-07-29") => 10, #Monday
irb(main):004:1* Date.parse("2013-07-31") => 7,  #Wednesday
irb(main):005:1* Date.parse("2013-08-02") => 3   #Friday
irb(main):006:1> }
=> {Mon, 29 Jul 2013=>10, Wed, 31 Jul 2013=>7, Fri, 02 Aug 2013=>3}
irb(main):007:0> ZeroFill.new(myDates).to_date
TypeError: no implicit conversion of Symbol into Integer
	from /Users/t27duck/workbench/mobi/lib/zero_fill.rb:41:in `[]'
	from /Users/t27duck/workbench/mobi/lib/zero_fill.rb:41:in `block in sorted_counts'
	from /Users/t27duck/workbench/mobi/lib/zero_fill.rb:41:in `sort'
	from /Users/t27duck/workbench/mobi/lib/zero_fill.rb:41:in `sorted_counts'
	from /Users/t27duck/workbench/mobi/lib/zero_fill.rb:10:in `initialize'
	from (irb):7:in `new'
	from (irb):7
	from /Users/t27duck/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/railties-4.0.2/lib/rails/commands/console.rb:90:in `start'
	from /Users/t27duck/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/railties-4.0.2/lib/rails/commands/console.rb:9:in `start'
	from /Users/t27duck/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/railties-4.0.2/lib/rails/commands.rb:62:in `<top (required)>'
	from bin/rails:4:in `require'
	from bin/rails:4:in `<main>'
````