src/Extract/Selection.php
public function eq($field_path, $value, $or_union_name = null)
    {
        $this->unit->eq($field_path, $value, $or_union_name);

        return $this;
    }
public function eq($field_path, $value, $or_union_name = null)
    {
        $this->unit->eq($field_path, $value, $or_union_name);

        return $this;
    }
@param string $field_path
@param string $value
@param string $or_union_name

@return \Interpro\Entrance\Extract\Selection