fix https://github.com/sagemathinc/smc/issues/978, which involved reverting working around a hack, which was itself due to a weird inconsistency in sage's strip_string_literals
fix https://github.com/sagemathinc/smc/issues/978, which involved reverting working around a hack, which was itself due to a weird inconsistency in sage's strip_string_literals

sagemathinc/smc,tscholl2/smc,tscholl2/smc,DrXyzzy/smc,DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc,sagemathinc/smc,tscholl2/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc,DrXyzzy/smc