gfa2fa - what happens when using the -s flag

[mb47]

Hi,

thanks for providing gfatools. I have a question re the gfa2fa module - what is the significance of the -s (stable) flag? When I extract the sequences to FASTA with the flag on, I get about a third of the number of sequences output, but the number of bases is the same as when running it without the flag. To me this suggests that some kind of merging of nodes happens with the flag on, presumably without loss of information. Could you explain the algorithm behind this please?
thanks