private List<? extends Predicate<? super T>> build() {
				return _operations.entrySet().stream()
					.sorted(Entry.comparingByKey())
					.map(Entry::getValue)
					.toList();
			}
Add a new operator tokens with its precedence.

@param precedence the precedence of the operators
@param operators the operators
@return {@code this} builder, for method chaining
jenetics.ext/src/main/java/io/jenetics/ext/internal/util/FormulaParser.java