The Thief archetype Rogue's [Second-Story Work](https://www.dndbeyond.com/classes/rogue#Second-StoryWork-365) (PHB, p. 97) feature states: 

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> [...] you gain the ability to climb faster than normal; climbing no longer costs you extra movement. 
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However, the [Centaur's Equine Build racial trait](https://www.dndbeyond.com/races/centaur#CentaurTraits) (GGR, p. 16) says:

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> In addition, any climb that requires hands and feet is especially difficult for you because of your equine legs. When you make such a climb, each foot of movement costs you 4 extra feet, instead of the normal 1 extra foot.
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Both of these in my opinion are specific, in the "specific beats general" type of rulings, but does one supersede the other? Would a Centaur Thief climb 40 feet or 8 feet (1+4 extra feet) per round?