Default string comparer for Enumerable.OrderBy is wrong in webGL

(new string[] { "abc", "XY", "CDE", "ijk" }).OrderBy(s => s).ToArray()

returns [abc, CDE, ijk, XY] on .NET, Unity and Mono, but returns [CDE, XY, abc, ijk] on Unity/webGL

It seems that the default string comparer should be case-insensitive, while it's currently case sensitive in webGL player.
I've tried an iOS build and it sorts correctly, so the issues seems to be confined to the webGL player implementation and not to IL2CPP.

To reproduce:
1. Build and run attached project for WebGL platform
2. Click Manual Test button
3. Notice that Enumerable.OrderBy returns wrong value

Reproducible: 5.5.0b7, 5.4.1.p4, 5.3.6p7