 by this class.</li>
	<li>Options which default value are boolean never get their value from a following argument like in <code>--boolopt true</code>.
	The only way to explicitly set the value of a boolean option is using the assignment expression defined by the second capture of pattern defined by field <code>_optpat</code> like in <code>--boolopt=false</code>.
	When the assignment expression is not present in the definition of a boolean option then the option received the value <code>true</code> by defaul