How could you accept that?

Interoperability with XQuery

• Incompatibility is minor (and not final). Examples:
  • boolean("false") is now false, $x["foo"] is now an error
  • New arithmetic types: 1.5 + 3.5 now yields 5.0, not 5
  • Implementation issues: namespace nodes
  • Minor errors: undefined things now defined
• It is clearly documented in the specs
• Only edge cases will be affected