Parameter URL encoding is inconsistent with Feign 10

I have a project that works under Feign 9 but is broken in Feign 10.

Consider the following example:

interface ExampleClient {
  @RequestLine("GET /search?text={text}")
  void search(@Param("text") String text);
}

Most values are automatically encoded when passed through. But if there is a value that appears to match a pre-encoded hex value it will not be encoded correctly.

text = %example% works correctly
text = %address% is not encoded correctly

I assume the problem is that the %ad in address could be interpreted as a hex value so feign is attempting to infer that the value is already encoded. The issue is that there is no reliable way to pass through a value like %address% that looks like a hex value but actually is not.

Start with the Feign 10 parameter-encoding path used by the Java example and reproduce the difference between %example% and %address%. Compare the behavior with Feign 9 to identify the regression. Done means values such as %address% are encoded reliably without being mistaken for already encoded data.