Feature request: use readr::type_convert() to match read_csv behavior

Would be great if read_excel() output followed similar behavior to read_csv in terms of determining column types, ie:

readxl::read_excel("data.xlsx") %>% readr::type_convert()

would be the default output of just running readxl::read_excel("data.xlsx")

该提问来源于开源项目：tidyverse/readxl