Document the values for ${^UTF8CACHE}

p4raw-id: //depot/perl@27589

diff --git a/pod/perlvar.pod b/pod/perlvar.pod
index 33c68a0..24db295 100644 (file)
--- a/pod/perlvar.pod
+++ b/pod/perlvar.pod
@@ -1148,6 +1148,8 @@ and is thereafter read-only.
 =item ${^UTF8CACHE}
 
 This variable controls the state of the internal UTF-8 offset caching code.
+1 for on (the default), 0 for off, -1 to debug the caching code by checking
+all its results against linear scans, and panicking on any discrepancy.
 
 =item ${^UTF8LOCALE}