ed that <code><a class="el" href="struct_g_o___fish_1_1allele__trajectories_1_1sim__constants.html#a3a5406282cfa4db45a72213bd5e50e65" title="how often to compact the simulation and remove fixed or lost mutations ">GO_Fish::allele_trajectories::sim_constants::compact_interval</a> &gt; 0</code>. (Though if <code>compact_interval == 0</code>, then there is no reason to employ the preserve function.) The remaining mutations will then be flagged as preserved so that compact will not remove them from the simulati