public @Nullable String exactAlias() {
        if (!this.success || this.component.type() != CommandComponent.ComponentType.LITERAL) {
            return null;
        }
        return this.consumed;
    }
Return the exact alias used, if the argument was static. If no alias was consumed
then {@code null} is returned.

@return the exact alias, or {@code null}
cloud-core/src/main/java/org/incendo/cloud/context/ParsingContext.java