I took a glance at Perk structs' default values, which sfall Perks.ini and set_perk_XXX api modifies.
The fields of SPECIAL 7 stats seems to be requirements:
negative value => test for less
positive value => test for greater or equal
The fields of skill1_mag/skill2_mag seems to be requirements.
Plus skill2=0x40000000 for karma requirement. (Harmless perk)
The field of stat_mag seems unused.
Stats/Skills modifications doesn't appear in the Perk structs.
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