Gets a config parameter value

# S4 method for tiledb_config
[(x, i, j, ..., drop = FALSE)

Arguments

x	`tiledb_config` object
i	parameter key string
j	parameter key string, currently unused.
...	Extra parameter for method signature, currently unused.
drop	Optional logical switch to drop dimensions, default FALSE, currently unused.

a config string value if parameter exists, else NA

cfg <- tiledb_config()
cfg["sm.tile_cache_size"]
#> sm.tile_cache_size 
#>         "10000000" 
cfg["does_not_exist"]
#> NA 
#> NA