TypeError
Truthiness
Added && and ||
Added exclusive or.
String#length
Added to-i and to-f
Remove new from core types.
Refactor add class.
Output formatting.
Add MIT License.
Add ARGV
ARGV tests.
Fix instance variables.
 String interpolation
WIP for IO and FILE
Add File.dirname and File.join
Add stdin, stdout, stderr.
Rename to file_descriptor
Testing IO is hard.
Yep hard.