[BUG] an edge case testing for negative durations fails

[line-o]

Describe the bug

Testing for negative durations can be achieved by testing if the duration is smaller than a zero second duration.
The following queries returns false() in existdb 5.3.0-SNAPSHOT:

xs:dayTimeDuration("-PT0.1S") < xs:dayTimeDuration("PT0S"),
xs:dayTimeDuration("-PT0.1S") < xs:dayTimeDuration("PT0.1S")

These tests however work as expected:

xs:dayTimeDuration("-PT0.1S") < xs:dayTimeDuration("PT1S"),
xs:dayTimeDuration("-PT1S") < xs:dayTimeDuration("PT0S")

Expected behavior

The above query to return true().
Saxon 10HE does return true().

To Reproduce

xquery version "3.1";

module namespace t="http://exist-db.org/xquery/test";

declare namespace test="http://exist-db.org/xquery/xqsuite";

declare
    %test:assertTrue
function t:test() {
    xs:dayTimeDuration("-PT0.1S") < xs:dayTimeDuration("PT0S")
};

Context (please always complete the following information):

• OS: macOS 10.15.6
• eXist-db version: 5.3.0-SNAPSHOT
• Java Version: openjdk version "1.8.0_252"

Additional context

• How is eXist-db installed? from source (748d916)
• Any custom changes in e.g. conf.xml? only http(s) ports