BioJulia Fastx import long{4}

I have a fast file that I loaded with FASTX and it seems that the data is stored as a LongDNA{4}. There are no ambiguities in the reads and I’d like to work with them as 2 bit sequences but I get an error when I try to convert these using BioSequences.

Is there someway to store them as 2bit using the FASTQ.Reader?