svn log, speaking on larry's behalf (>):
+The string concatenating form is:
+
+    <a b> X~X <1 2>           #  'a1', 'a2', 'b1', 'b2'
+
+The C<X~X> operator desugars to something like:
+
+    [~]«( <a b> X <1 2> )  #  'a1', 'a2', 'b1', 'b2'


...and later...

+The C<X> variant crosses the arrays but concatenates strings:
+
+    <a b> X <1 2>
+
+produces
+
+    'a1', 'a2', 'b1', 'b2'

If the C<X> variant already concatenates strings, why is it done
explicitly in the desugaring of C<X~X>? Probably not what you
intended.

Kindly,
// masak

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