Function codepoint_equal 

pub fn codepoint_equal<N: DomNavigator>(
    _context: &mut DynamicContext<'_, N>,
    args: Vec<XPathValue<N>>,
) -> Result<XPathValue<N>, XPathError>

fn:codepoint-equal($comparand1 as xs:string?, $comparand2 as xs:string?) as xs:boolean?

Compares two strings by codepoint.