m4.js : Possible mistake in Orthographic's documentation

[2ndwolf]

Computes a 4-by-4 orthographic projection matrix given the coordinates of the
planes defining the axis-aligned, box-shaped viewing volume. The matrix
generated sends that box to the unit box. Note that although left and right
are x coordinates and bottom and top are y coordinates, near and far
are not z coordinates, but rather they are distances along the negative
z-axis. We assume a unit box extending from -1 to 1 in the x and y
dimensions and from -1 to 1 in the z dimension.

There may be a mistake here, if z dimension used the same unit box as x and y wouldn't we have a phrase more like "We assume a unit box extending from -1 to 1 in the x, y and z dimensions"?

From reading the rest, it probably was meant to be:
We assume a unit box extending from -1 to 1 in the x and y dimensions and from -1 to 0 in the z dimension.

Same goes for frustum's description.