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-rw-r--r--NEWS5
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@@ -7,6 +7,11 @@ Note also the list of incompatibilities in the README file.
 Changes since 5.0.0
 -------------------
 
+Numeric constants encountered in mathematical expressions (but not other
+contexts) can contain underscores as separators that will be ignored on
+evaluation, as allowed in other scripting languages.  For example,
+0xFFFF_FFFF, or 3.141_592_654.
+
 "functions -T" turns on tracing for the specified function(s) only,
 similar to "functions -t" except that tracing is turned off for any
 functions called from the specified one(s) that don't also have the -t