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[netcdfgroup] NF90_CHAR unlimited dimension behavior

Hello,

I have a few questions about NetCDF Fortran behavior.

1) Unlimited dimension x Fixed dimension
In NetCDF v4.2.1.1, the following statements work:

    integer :: ncid, dimid1, dimid2, varid1, varid2
call check( nf90_create("strings.nc", OR(NF90_NETCDF4, NF90_CLOBBER), ncid) ) 

    call check(nf90_def_dim(ncid, "testfixed", 10, dimid1))
    call check(nf90_def_dim(ncid, "testinf", NF90_UNLIMITED, dimid2))
call check(nf90_def_var(ncid, "infvar", NF90_CHAR, (/ dimid2, dimid1 /), varid2)) 

    call check(nf90_put_var(ncid, varid2, "abcdef", (/ 1, 2 /)))
    call check(nf90_put_var(ncid, varid2, "testasdfasdfasdfasdf"))
However, once I start using v4.3.2, I got this error with the exact same code above: 
  ** ERROR: NetCDF: Start+count exceeds dimension bound

This also seems to be present in the latest version (v4.3.3.1).
It's interesting to note that the reverse does not apply - Fixed dimension x Unlimited dimension works on all versions.
The NetCDF-Fortran version is v4.2 with the v4.2.1.1 NetCDF library version, and v4.4.2 for the other, more updated versions. 

Is this normal behavior, or is this a regression of sorts?

2) Unlimited dimension x Unlimited dimension
I also tried this:
    integer :: ncid, dimid1, dimid2, varid1, varid2, varid3, i
call check( nf90_create("strings.nc", OR(NF90_NETCDF4, NF90_CLOBBER), ncid) ) 

    call check(nf90_def_dim(ncid, "testfixed", 10, dimid1))
    call check(nf90_def_dim(ncid, "testinf", NF90_UNLIMITED, dimid2))
call check(nf90_def_var(ncid, "infinf", NF90_CHAR, (/ dimid2, dimid2 /), varid3)) 
    do i = 1, 1000
        call check(nf90_put_var(ncid, varid3, "test"))
    end do
call check(nf90_put_var(ncid, varid3, (/ "testasdfasdfasdfasdf", "testabcdefghijklmnop", "testqrstuvwxyz1234" /)))
...which does not work on either version. Would it be possible to have this kind of behavior? 

3) NF90_STRING (NC_STRING)
According to https://bugtracking.unidata.ucar.edu/browse/NCFORTRAN-29 it seems that NF90_STRING is not implemented at the moment. Is this true? I tried NF90_STRING before and always get: 

    ERROR: NetCDF: Start+count exceeds dimension bound
Note that I tested it with a newer version (NetCDF v4.3.2+), since the older library (v4.2.1.1) had a bug with handling the NC_STRING type (https://bugtracking.unidata.ucar.edu/browse/NCF-206). 

Thanks in advance!

Best regards,
Albert
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