* add another check if previous gear is owned
* respect gear purchase order
* catch error with miscalculation of equipment number floor
* add integration test for proper equipment purchasing order
* fix syntax
* add 'previousGearNotOwned' string
* rewrite logic for different starting levels for wep vs others
* separate and add tests for armor and weapon
* rename variable for clarification
* skip check if itemIndex is NaN
* change obscure NaN check for readability
* change conditional from checking NaN to Int
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