default boolean readBoolean() {
        return BOOLEAN_LIBERAL_TRUE.contains(this.readString().toUpperCase(Locale.ROOT));
    }
Reads the {@link #readString() string until the next whitespace} and parses
in into a {@link Boolean}.

@return the parsed boolean
@throws IllegalArgumentException If the string cannot be parsed into a {@link Boolean}.
cloud-core/src/main/java/org/incendo/cloud/context/CommandInput.java