[basex-talk] Stack overflow instead of syntax error

We have some code generation and it produced a syntax error. However, running 9.2.4 in production, the server gave a stack overflow tail recursion instead of "Cannot convert xs:integer to xs:date: 1970." (like the GUI did).

Here was the error reported: java.lang.RuntimeException: org.basex.core.BaseXException: Stack Overflow: Try tail recursion?

Here is the snippet of code that originally cause the 'stack overflow'. The issue is the date is not in quotes.

function($endDate as xs:date?) as xs:Boolean { let $intervalBeginDate := xs:date(2019-09-30) let $intervalEndDate := xs:date(2019-09-30) return ($endDate ge $intervalBeginDate) and ($endDate le $intervalEndDate) };

However, when I fix the code generation, everything is fine (see new code below). Just seems "strange" that this would cause the server to throw a 'stack overflow' error.

function($endDate as xs:date?) as xs:Boolean { let $intervalBeginDate := xs:date('2019-09-30') let $intervalEndDate := xs:date('2019-09-30') return ($endDate ge $intervalBeginDate) and ($endDate le $intervalEndDate) };

Buddy