default R startsWith(CharSequence prefix) {
    Objects.requireNonNull(prefix, "prefix");
    return Matchers.extract(this).applyAndCreateRoot(e -> Expressions.binaryCall(StringOperators.STARTS_WITH, e, Expressions.constant(prefix.toString())));
  }
Check that string attribute starts with {@code prefix} prefix
criteria/common/src/org/immutables/criteria/matcher/StringMatcher.java