code: public JsonParserBuilder floatingHandler(@Nullable FloatingHandler floatingHandler) {
          checkNoConflict(floatingHandler, "floating", numberHandler, "number");
          this.floatingHandler = floatingHandler;
          return this;
      }
docs: Sets the parser's floating value handler, or removes it if {@code null} is passed.
  
  @param floatingHandler a new floating value handler. {@code null} means there shouldn't be a floating
  value handler in the built parser.
  @return a reference to this builder
  @throws java.lang.IllegalStateException if {@link #numberHandler()} is already set