test: hidden phasing property in GenotypesPLINK
class
#153
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This PR adds tests for a hidden feature in the
GenotypesPLINK
class: the_prephased
property. It can save memory and time when you already know that your genotypes are phased: we won't have to load and check the phase information when reading your genotypes.I'll take this opportunity to stress that this function should not be used in any real scripts or code! It's just for internal (and theoretical) use. In fact, I'm creating this PR because I think the code doesn't work properly, and I'm trying to reproduce some issues I was having with it.