However, it does link to another document entitled Butterfly Mechanism Keycap Replacement MacBook Pro (2018), which references the membrane under the keycaps as a method of stopping debris from entering the keyboard.
"The keyboard has a membrane under the keycaps to prevent debris from entering the butterfly mechanism", the document reads.
Nearly the entire range of MacBooks is there with the previous generation of notebooks heavily featuring amongst the discounts, just as you might expect. It also states that "the procedure for the space bar replacement has also changed from the previous model", which reminds me of how I've seen colleagues frantically trying to click their space bar into working again.
According to a new video from YouTuber Dave Lee, the MacBook Pro 2018 Core i9 edition heats up very quickly, causing the throttling to kick in and lower the clock speed of the processor. Be careful not to tear the membrane. The Mac has a 2880 x 1800 IPS display with wide color gamut and excellent contrast, the 3rd gen Butterfly keyboard with quieter switches, the new Apple T2 coprocessor and the Touch Bar.
Apple didn't offer up any further details, but iFixit's teardown revealed that the new MacBooks - the most expensive of which costs more than £6,000 - feature a thin layer of rubberised silicon material around updated butterfly mechanism, in order to stop dust and muck from getting inside.
But that's not the biggest problem these MacBook keyboards face.
The US version of the document doesn't mention the membrane specifically.
Unfortunately, owners of the new MacBook Pro with the i9 processor are finding their computers are having a hard time reaching the advertised 2.9GHz speeds - mainly because the laptop's built-in cooling system can't keep up with the intense heat that the Core i9 produces.
Summing it all up, it looks like Apple slapped a Core i9 into a MacBook Pro design that was never meant to support such power and heat.