Try reordering your use statements:

use Geo::ShapeFile::Point comp_includes_m => 0, comp_includes_z => 0;
use Geo::ShapeFile;
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From the "Important Note" in the documentation:

This module uses overloaded operators to allow you to use == or eq to compare two point objects. By default points are considered to be equal only if their X, Y, Z, and M attributes are equal. If you want to exclude the Z or M attributes when comparing, you should use comp_includes_z or comp_includes_m when importing the object. Note that you must do this before you load the Geo::ShapeFile module, or it will pass it's own arguments to import, and you will get the default behavior