Blender Version
Broken: 2.78c

Short description of error
bpy.types.MeshTextureFace.uv property description says it's a flat 8-element array while in fact it's an array of 2-element arrays.
Code of corresponding accessor functions (rna_MeshTextureFace_uv_*() in "source/blender/makesrna/intern/rna_mesh.c", lines 552–573 for Git commit a2d246c5c0b6) clearly shows that the latter is actually the intended behavior and the problem is in the documentation.