Dynamic array length ABI unit

[via Digitalmars-d]

Regarding the D ABI, http://dlang.org/abi.html , I've noticed 
that the description for dynamic arrays seems ambiguous:

    offset   property  contents
    0        .length   array dimension
    size_t   .ptr      pointer to array data
Couldn't "array dimension" be either in bytes or in T units, for 
a T[]? It seems to be in bytes (I had assumed it was in T units). 
If you agree that it is ambiguous, please tweak the description 
to be more precise.