shell -e (exit on error) (mis)behaviour

Shell	false	non-exist	()-caught	()-uncaught	{}-caught	{}-uncaught	false \|\| false	+e(-e)	+e{-e}
Solaris9-SH	X255	X1	0C	0 X255	0 X255	0 X255	X255
FreeBSD[2-6]-SH NetBSD1.3.2-SH	X1	X127	0C	0 X1	0 X1	0 X1	X1
Ultrix4.4-SH	X1	X1	0 X1	0 X1	0 X1	0 X1	X1
Ultrix4.4-KSH	X1	X1	01	0 X1	01	0 X1	X1
Irix6.5-SH Irix6.5-KSH Solaris9-KSH -KSH93 OpenBSD3.7-SH -PDKSH5.2.14.2 -ZSH4.[23]. FreeBSD7-SH	X1	X127	01	0 X1	01	0 X1	X1
-ZSH5..* FreeBSD-[89]-SH OpenBSD6.1-SH Ubuntu-Dash-0.5.7 Ubuntu-Bash-4.3.11	X1	X127	01	0 X1	01	0 X1	X1	0C X1	0 X1
-ZSH3.1.6 BASH-4.0.	X1	X1	01	0 X1	01	0 X1	X1
*-BASH-3.2	X1	X1	01	0	01	0 X1	X1
*-BASH-{2,3.[01]} Debian-DASH	X1	X127	01	0	01	0 X1	X1
NetBSD2.0-SH	X1	X127	01	0	01	0 X1	-
SUSv3/POSIX	X1 ?	X127 ?	01 ?	0 ?	01 ?	0 X1 ?	X1 ?	0C X1	0 X1

Where:

false: false
non-existent: try to run a non-existent command
()-caught: ( echo 0; false ; echo 1 ; ) || echo "Caught"
()-uncaught: ( echo 0; false ; echo 1 ; )
{}-caught: { echo 0; false ; echo 1 ; } || echo "Caught"
{}-uncaught: { echo 0; false ; echo 1 ; }
false || false: false || false
+e(-e): set +e; ( set -e; echo 0; false; echo 1; ); R=$?; if [ $R -ne 0 ]; then echo Caught; exit $R; fi; set -e
+e{-e}: set +e; { set -e; echo 0; false; echo 1; }; R=$?; if [ $R -ne 0 ]; then echo Caught; exit $R; fi; set -e

and

X<num>: shell exits with exitcode <num>
-: no output (no exit).
0: 0 echoed (usually exits as well).
01: 0 and 1 echoed (no exit). It seems as it thinks the commands are guarded but the guard doesn't trigger because "echo 1" returns 0.
0C: 0 and Caught echoed (no exit). The guard triggers the moment 'false' returns non-0.

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