anchor.diff:  `grepp --context-lines string`
   +
     Error: 'string' is not a valid integer.
  ++
  +In `go-getoptions` this is accomplished with:
  ++
  +- `ptr := opt.Int(name, default_value, aliases)`.
  +- `opt.IntVar(&ptr, name, default_value, aliases)`.
   
   Options with Floating point arguments::
   Parse an option string argument into a Floating point value and provide an user error if the string provided is not a valid floating point.
  
positive.code: and:
  +
  `command --no-verbose`, or `command --noverbose`
  
  That covers the most basic set of features, but still it is not enough to get past a basic program.
  The following features will allow for a more complete interface.
  
  Options with array arguments::
  This allows the same option to be used multiple times with different arguments.
  The list of arguments will be saved into an Array like structure inside the program.
  For example:
  +
  `list-files --exclude .txt --exclude .html --exclude .pdf`
  
  Options with Key Value arguments::
  This allows the same option to be used multiple times with arguments of key value type.
  For example:
  +
  `rpmbuild --define name=myrpm --define version=123`
  
  Both features above should support the basic types listed before: string, integer and floating point.
  
  The features above are useful when you have a variable amount of arguments, but it becomes cumbersome for the user when the number of entries is always the same.
  The features described below and meant to handle the cases when each option has a known number of multiple entries.
  
negative.code: For example:
  +
  `ls --all`
  +
  In `go-getoptions` this is accomplished with:
  +
  - `ptr := opt.Bool(name, default_value, aliases)`.
  - `opt.BoolVar(&ptr, name, default_value, aliases)`.
  - Additionally, if all you want to know is if the option was passed you can use: `opt.Bool(name, default_value, aliases)` (without capturing its return value) and then check `opt.Called(name)`.
  
  Options with String arguments::
  The option will accept a string argument.
  