Read.dcf with no newline ending: gzfile drops last line

I don't know if this is a bug per se, but an undesired behavior in
read.dcf.  read.dcf takes a file argument and passes it to gzfile if
it's a character:
    if (is.character(file)) {
        file <- gzfile(file)
        on.exit(close(file))
    }
This gzfile connection is passed to readLines (line #39):
lines <- readLines(file)

If no newline is at the end of the file, readLines doesn't give a
warning (I think appropriate behavior).  If a DESCRIPTION file doesn't
happen to have a newline at the end of it (odd, but it may happen),
then the last tag is dropped:

x = "Package: test

+ Type: Package"

######################################
# No Newline in file
######################################
fname = tempfile()
writeLines(x, fname, sep = "")

### readlines with character - warning but all fields
readLines(fname)

[1] "Package: test" "Type: Package"
Warning message:
In readLines(fname) :
  incomplete final line found on
'/var/folders/1s/wrtqcpxn685_zk570bnx9_rr0000gr/T//Rtmpz95dsT/file180a65a6b745'

### readlines with file connection - warning but all fields
file_con <- file(fname)
readLines(file_con)

[1] "Package: test" "Type: Package"
Warning message:
In readLines(file_con) :
  incomplete final line found on
'/var/folders/1s/wrtqcpxn685_zk570bnx9_rr0000gr/T//Rtmpz95dsT/file180a65a6b745'

### readlines with gzfile connection
## no warning and drops last field
gz_con = gzfile(fname)
readLines(gz_con) # ONLY 1 lines!

[1] "Package: test"

######################################
# No Newline in file - fine
######################################
### readlines with gzfile connection
## no warning and drops last field but OK
writeLines(x, fname, sep = "\n")
gz_con = gzfile(fname)
readLines(gz_con)

[1] "Package: test" "Type: Package"

Currently I use file(fname) before read.dcf to be sure a warning
occurs, but all fields are read.  I didn't see anything in read.dcf
help about this.  readLines states clearly:
"If the final line is incomplete (no final EOL marker) the behaviour
depends on whether the connection is blocking or not", but it's not
100% clear that read.dcf uses gzfile if the file is not compressed.


Thanks
John