@Nonnull
    public static Optional<Number> parse(@Nonnull String s) {
        return Optional.ofNullable(parseNullable(s));
    }
Utility methods for parsing {@link Number}s, {@link Integer}s, {@link Long}s,
{@link Float}s and {@link Double}s from {@link String}s.
helper/src/main/java/me/lucko/helper/function/Numbers.java