What does the UV0 array mean in the Procedural Mesh Component?

Development Rendering
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In A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums there is an array like this
TArray UV0;
UV0.Add(FVector2D(0, 0));
UV0.Add(FVector2D(10, 0));
UV0.Add(FVector2D(0, 10));
but uv mapping is supposed to be done with values between 0 and 1 (UE4: Dynamic Texture Coordinates (Animated, Generated UVs) - YouTube), here they appear between 0 and 10.