knn_recheck regress failing under PostgreSQL 10 devel

[robe]

Debbie's 10 develop jobs have been failing on knn_recheck regress

knn_recheck .. failed (diff expected obtained: /var/lib/jenkins/workspace/postgis/regress_pgdev/tmp/2_3_pg10.0w64/test_94_diff)
-----------------------------------------------------------------------------
--- knn_recheck_expected	2016-06-07 22:02:08.819804960 +0000
+++ /var/lib/jenkins/workspace/postgis/regress_pgdev/tmp/2_3_pg10.0w64/test_94_out	2016-09-29 04:04:30.003485948 +0000
@@ -13,8 +13,8 @@
 #3|1|147|9.6598|9.6598
 #3|1|291|10.8780|10.8780
 #3|1|292|13.4929|13.4929
-#3|500003|500004|1447.7424|1447.7424
 #3|500003|500002|1447.7424|1447.7424
+#3|500003|500004|1447.7424|1447.7424
 #3|500003|500001|3423.4486|3423.4486
 #3|500003|500005|3423.4486|3423.4486
 #3|500003|22837|5123.7770|5123.7770
@@ -59,7 +59,7 @@
 #2g|30695|21264.3654|21264.3654
 #2g|30512|25313.2118|25313.2118
 #3g|1000|t
-#3g|2614|t
+#3g|2614|f
 #3g|500000|t
 #1g|500000|0.0000|0.0000
 #1g|600003|69974.6935|69974.6935
@@ -72,7 +72,7 @@
 #2g|30695|21264.3654|21264.3654
 #2g|30512|25313.2118|25313.2118
 #3g|1000|t
-#3g|2614|t
+#3g|2614|f
 #3g|500000|t
 #1nd-3|290|260.6797|260.6797
 #1nd-3|287|264.3000|264.3000
@@ -89,10 +89,10 @@
 #3nd-3|1|294|9.6598|9.6598
 #3nd-3|1|582|10.8780|10.8780
 #3nd-3|1|583|13.4929|13.4929
-#3nd-3|500003|500004|1448.3262|1448.3262
 #3nd-3|500003|500002|1448.3262|1448.3262
-#3nd-3|500003|500001|3424.9088|3424.9088
+#3nd-3|500003|500004|1448.3262|1448.3262
 #3nd-3|500003|500005|3424.9088|3424.9088
+#3nd-3|500003|500001|3424.9088|3424.9088
 #3nd-3|500003|45674|5153.7747|5153.7747
 #3nd-3|600001|600002|0.0000|0.0000
 #3nd-3|600001|9752|54.2730|54.2730
-----------------------------------------------------------------------------

I'm not sure which PostgreSQL commit this started happening in, since I don't keep logs that far back. At the very least since Sept 23rd.

I'm going to revisit this time permitting since 10.0 is a year's off so might be resolved by then.