Update from 1.8.5 to 1.8.8 breaks my self-signed numeric IP certificate

I recently upgraded from 1.8.5 to 1.8.8 via macports. The new version
refused to permanently accept my self-signed certificate, citing an
"unknown error".

Certificates generated on Windows 2008 Server using VisualSVN 2.7.4.

Hostname is a numeric IP on a VPN (192.168.100.59)

Client is Mac OS X 10.9.1 (Mavericks) with svn installed via Macports:
   subversion @1.8.5_1+universal (active) <---- this setup works
   subversion @1.8.8_0+no_bdb+universal <---- this setup fails

Under 1.8.8:
$ svn update
Updating '.':
Error validating server certificate for 'https://192.168.100.59:443':
  - The certificate has an unknown error.
Certificate information:
  - Hostname: 192.168.100.59
  - Valid: from Mar 1 02:21:16 2014 GMT until Feb 27 02:21:16 2024 GMT
  - Issuer:
  - Fingerprint: BE:C4:65:B6:0E:BD:5C:EE:F4:DB:A9:E1:EB:AE:B6:BC:43:F2:E7:5E
(R)eject or accept (t)emporarily? t
At revision 46.

Under 1.8.5 with no other changes:
$ svn update
Updating '.':
At revision 46.
Received on 2014-03-03 07:09:49 CET