Update ZDR normalization entry with path forward

http://colabti.org/irclogger/irclogger_log/perl6-dev?date=2018-09-21#l248

TODO/FEATURES.md

@@ -26,6 +26,29 @@ Need to decide whether there's a away to avoid LTAness with normalized ZDRs
 or to fix all the bugs with non-normalized ZDRs and ensure all the propspec
 concerning this is as it should be.
 
+UPDATE: TimToady OKed making throwage exceptions less precise and then we can 
+normalize ZDRs and be happy: http://colabti.org/irclogger/irclogger_log/perl6-dev?date=2018-09-21#l248
+
+```
+15:41 	TimToady 	.
+15:41 	yoleaux 	09:17Z <Zoffix> TimToady: what's your opinion on changing 6.c 
+spec's test that tests for "4" in this exception: `my $x = 4/0; say 42 + $x; => 
+Attempt to divide 4 by zero using div`. There are a couple of bugs to fix and 
+some performance benefits to reap if we don't report any particular value. We'd 
+do so by normalizing all zero-denominator Rationals to <-1/0>, <0/0>, and <1/0>
+15:41 	yoleaux 	09:26Z <Zoffix> TimToady: well, bugs could be fixed with 
+other means, by basically slowing down the common Rational ops with edge-case 
+logic to handle zero-denominator Rationals (ZDRs). Basically by normalizing 
+them the check for ZDRs becomes just a denominator check (and I tried marking 
+them with a role instead and doing MMD in the past, but dispatch ambiguities 
+creep up due to Rational role)
+15:41 		p6bannerbot set mode: +v ExtraCrispy
+15:41 	TimToady 	I'm fine with normalizing the inv/nan rats
+15:41 	Zoffix 	\o/
+15:42 	TimToady 	it's not like nums carry that info along either
+```
+
+
 ### Stakeholder
 
 Zoffix