Neutral marking is the dominant strategy especially in the Chinese sources, but occasional distinctions are made following nominative-accusative alignment.
Usage varies considerably with both English and Chinese sources. I and my are both used in subject position, while both he and him are used in object position. See Smith (2008) for discussion.
Source: Tong 1862: IV.72
Source: Tong 1862: IV.69
Source: Tong 1862: IV.75
Source: Tong 1862: VI.70