Work in progress.

String.prototype.GOBS_String_replaceAt: fix
Work in progress.

String.prototype.GOBS_String_replaceAt: fix
Revert "Work in progress."

This reverts commit 8c7726f1f1c411e1eddc8c2111e862ed15ac229f.
Work in progress.

String.prototype.GOBS_String_replaceAt: fix