[Nuanced]

Summary: 
Enchanting a Boulder material weapon (Dagger, Shuriken) with a Feather has failed to halve the weight.

      Details: 

• My weapons are the Venomous and Knock Down variants of Shuriken.
  
• Boulder material is very heavy, so naturally I've enchanted them with the Feather enchantment to alleviate this.
  
• I did the enchants myself. I am a level 1 Enchanter +1 from LE.
  
• My weapons still weigh a ton with no noticeable changes in combat.
  

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5 Base Weight
+25 Mat Weight
30 Total Weight 

-7.5 Talent Reduction
-2 Lightweight

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12 Base Weight
+25 Mat Weight
37 Total Weight

-7.5 Talent Reduction
-2 Lightweight

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So, if my numbers are right- Depending on if Talent and Thinning weight are taken before or after the weight halving-

The top one should weigh 10.25 at most, 5.5 at least.
The bottom one 13.75 at most, 9 at least.

With my other equipment weighing 0, this should make me at heaviest 24 weight.
Even if the calculations are played out differently, the numbers aren't adding up to any difference granted by the enchant.

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I have no idea if this is intentional or not, but I found it worth bringing up since I've a feeling this should work proper.

[Trexmaster]

The talent doesn't reduce weapon weight, it reduces Battle Weight, so you won't see it changing the weight value.

What seems to be happening here is that Feather is halving the base weight of the weapon, not any modifiers to it.

[Nuanced]

If this is the case and how it was intended to work, then I think it should be specified on the enchant that the modifier only applies to base weight.

[Snake]

Probably should, yeah.

[Neus]

This should be corrected in 2.72.