use 'add()' rather than 'push_back()' API (so options are respected)
use 'add()' rather than 'push_back()' API (so options are respected)

JanMarvin/rstudio,jar1karp/rstudio,JanMarvin/rstudio,jar1karp/rstudio,jar1karp/rstudio,jrnold/rstudio,jrnold/rstudio,JanMarvin/rstudio,jrnold/rstudio,jrnold/rstudio,jar1karp/rstudio,jar1karp/rstudio,jar1karp/rstudio,jar1karp/rstudio,jrnold/rstudio,JanMarvin/rstudio,jrnold/rstudio,jar1karp/rstudio,jrnold/rstudio,JanMarvin/rstudio,jrnold/rstudio,JanMarvin/rstudio,jar1karp/rstudio,JanMarvin/rstudio,JanMarvin/rstudio,jrnold/rstudio,JanMarvin/rstudio