MCM and Enlighten Too few decimal places

[PoBIssueBoy]

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What is the value from the calculation ingame?

Ingame Helmet Corruption Socketed Skill Gems Get a 90% Cost & Reservation Multiplier (0.90 MCM) with Enlighten 4 Socketed (0.80 MCM) results in 0.90*0.88 = 0.792

Resulting in, with an efficiency of .7092 (which goes to 4 decimal places) an ingame reservation for 50% auras of 28.08%

What is the value from the calculation in Path of Building?

In POB Helmet Corruption Socketed Skill Gems Get a 90% Cost & Reservation Multiplier (0.90 MCM) with Enlighten 4 Socketed (0.80 MCM) results in 0.90*0.88 = 0.79

Resulting in, with an efficiency of .7092 (which goes to 4 decimal places) an ingame reservation for 50% auras of 28.01%

This results in an extra 2 mana in PoB compared to ingame

How to reproduce the issue

Select an 50% (or any) Aura skill
Equip a helmet with Socketed Skill Gems Get a 90% Cost & Reservation Multiplier implicit
Link enlighten 4 to the aura in the helmet

MCM should be inaccurate

Character build code

https://pastebin.com/25mFhKfn

Screenshots