begin adding support for left/right sameness in BIN/BIN and AN/AN splicers
fix broken test - was checking sameness without specifying preserveIdentity
left and right same-ness now seem to be working :-)
left and right same-ness now seem to be working :-)
enable testing of right same-ness for AN/AN splicing
fix right same-ness for AN/AN splicing
tweak test to cover a bit more code
more consistent code
share code to increase coverage
share code to increase coverage