qgis - Knowing TYPE parameters accepted values for RQGIS?

I'm trying to use RQGIS interface with QGIS to create a polygon grid. One of the required parameters is TYPE.

Where can i know the type of parameters to this algorithm? and to others?

From

data

Code:

neto  <- readRDS("/path/") #download data from link

# Finding QGIS algoritms 
dir_tmp <- "/my/path/"
my_env <- set_env()

find_algorithms(search_term = "grid")
params <- get_args_man(alg = "qgis:creategrid", qgis_env = my_env)

params$TYPE <- "polygon"
params$EXTENT <- nnetpro
params$HSPACING <- "10" does it accept numeric?
params$VSPACING <- "10" does it accept numeric?
params$CRS <- "EPSG:31983" #does it work with CRS("+init=epsg:31983")?
params$OUTPUT <- file.path(dir_tmp, "g10m.shp")



out <- run_qgis(alg = "qgis:creategrid",
                params = params,
                load_output = params$OUTPUT,
                qgis_env = my_env)

Error in run_qgis(alg = "qgis:creategrid", params = params, load_output = params$OUTPUT,  : 
Error: Wrong parameter value: polygon