# \U1f530 japanese beginner symbol
# console
set bj \U1f530
🔰
string range $bj 0 0
\ud83d
string range $bj 0 1
🔰
# compare difference in startscreen (AndroWish, undroidwish) app, see http://taipu.de/andra

best regards
Roland Frank

Works as designed. The binary undroidwishes are built from the
wtf8-experiment branch which uses a variant of TCL_UTF_MAX=3
representing unicode code points beyond 0xFFFF as a surrogate
pair internally. This is documented in the short release notes
in http://www.androwish.org/download/index.html since the
release "The Leyden Jar" (2017-10-11).

If you want the same behavior as in AndroWish you need to
compile your own undroidwish with TCL_UTF_MAX=6 by changing
the relevant build-undroidwish-*.sh script.

This is in part addressed and fixed by check-in [eec087c781].
The upstream Tcl core-8-6-branch added logic to support the
"string range" command to deal with surrogate pairs.