+- horizontal lines in the layout still consume data cells
+ and can be mixed with actual data on the same table line
+ synaptics(4) found by tedu@ Mon, 17 Aug 2015 21:17:42 -0400
+ loc ** exist ** algo ** size ** imp ***
+
+- the "w" layout option is ignored
+ synaptics(4) found by tedu@ Mon, 17 Aug 2015 21:17:42 -0400
+ loc * exist * algo * size * imp **
+
+- the "s" layout column specifier is used for placement of data
+ into columns, but ignored during column width calculations
+ synaptics(4) found by tedu@ Mon, 17 Aug 2015 21:17:42 -0400
+ loc * exist ** algo *** size * imp **
+
+- support mdoc(7) and man(7) macros inside tbl(7) code;
+ probably requires the parser reorg and letting tbl(7)
+ use roff_node such that macro sets can mix;
+ informed by bapt@ that FreeBSD needs this.
+ loc *** exist ** algo *** size ** imp ***
+