[BUG] `is_*()` return `FALSE` for nonexistent paths, but documentation says they should return `NA`

[Yousa-Mirage]

fs::is_*() appears to behave inconsistently with its documentation, including is_file(), is_dir(), is_link() and is_file_empty(). My fs is the newest 2.1.0.

The documentation for is_file() says:

A named logical vector, where the names give the paths. If the given object does not exist, `NA` is returned.

However, is_file() (and other funcs) returns FALSE for nonexistent paths instead of NA:

print(packageVersion("fs"))
#> [1] '2.1.0'

fs::is_file("unexisting_file.txt")
#> unexisting_file.txt 
#>               FALSE
fs::is_dir("unexisting_dir/")
#> unexisting_dir/ 
#>           FALSE
fs::is_link("unexisting_link")
#> unexisting_link 
#>           FALSE
fs::is_file_empty("unexisting_file.txt")
#> unexisting_file.txt 
#>               FALSE

There is the current R implementation code. Since !is.na(res$type) is used, nonexistent paths are converted to FALSE rather than propagating NA.

print(fs::is_file)
#> function (path, follow = TRUE) 
#> {
#>     res <- file_info(path, follow = follow)
#>     setNames(!is.na(res$type) & res$type == "file", path)
#> }
#> <bytecode: 0x59ab3f485828>
#> <environment: namespace:fs>

This creates a mismatch between documentation and implementation. I wonder which behavior is intended:

• If FALSE is intended for nonexistent paths, the documentation should be updated.
• If NA is intended for nonexistent paths, the implementation should be changed.

I'm glad to create a PR to fix this.