The following test-cases use decimal literals of a precision higher than 18 totalDigits (minimum requirement):

op-logical-and-066
op-logical-and-068
op-logical-or-066
op-logical-or-068

err:FOCA0006 should be added to the possible outcome of the test-cases or literals of lower precision should be used, because casting to xs:decimal is implementation-defined if the value cannot be represented accurately with the number of decimal digits available to the implementation:

FO § 17.1.1:
In casting to xs:decimal or to a type derived from xs:decimal, if the value is not too large or too small but nevertheless cannot be represented accurately with the number of decimal digits available to the implementation, the implementation may round to the nearest representable value or may raise a dynamic error [err:FOCA0006].
The choice of rounding algorithm and the choice between rounding and error behavior and is implementation-defined.

XQ § 3.1.1 Literals:
The value of a numeric literal containing an e or E character is an atomic value of type xs:double.
The value of the numeric literal is determined by casting it to the appropriate type according to the rules for casting from xs:untypedAtomic to a numeric type as specified in Section 17.1.1 Casting from xs:string and xs:untypedAtomic [FO].