handle overwriting boolean field with arity = 0, e.g. "-parse -parse"

[galaxyeye]

    /**
     * TODO: fix bug to handle overwriting boolean field with arity = 0, e.g. "-parse -parse"
     * */
    private fun doParse() {
        registeredObjects.add(this)

        jc = JCommander.newBuilder()
                .acceptUnknownOptions(acceptUnknownOptions)
                .allowParameterOverwriting(allowParameterOverwriting)
                .expandAtSign(expandAtSign).build()
        registeredObjects.forEach { jc.addObject(it) }

        if (argv.isNotEmpty()) {
            jc.parse(*argv)
        }
    }