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diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff
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@@ -17,6 +17,13 @@ Version 4.87
3. Transports now take a "max_parallel" option, to limit concurrency.
+ 4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}.
+ The latter expands to a 8-element colon-sep set of hex digits including
+ leading zeroes. A trailing ipv4-style dotted-decimal set is converted
+ to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6.
+ The former operator strips leading zeroes and collapses the longest
+ set of 0-groups to a double-colon.
+
Version 4.86
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