Bigger --deltas dump with 1.7.5 than with 1.6.17

After comparing two dumps of the same repository, one obtained
with Subversion 1.6.17 and one obtained with 1.7.5, both with
--incremental --deltas (both from revision 0, but not with the
same upper revision), I've noticed two changes:

1. The properties are reordered (that was expected after the change
   in libapr).

2. Text content is sometimes larger with 1.7.5. For instance:

 Text-delta: true
 Text-delta-base-md5: 6c17738e070af8b69a4814ddc7484f69
 Text-delta-base-sha1: ccbb2233b14ee51093a0c0bd08bc26ba1e88ee46
-Text-content-length: 7307
+Text-content-length: 7336
 Text-content-md5: 6afa974df763d6384836d45ee610e77c
 Text-content-sha1: 9c65c4ab034d21fcf355ff4bc0b1a0c2d12f2fb1
-Content-length: 7307
+Content-length: 7336

 Text-delta: true
 Text-delta-base-md5: 26671cc408dcbaedd8dfe5accdf09b7c
 Text-delta-base-sha1: 710a2c42023a8790ab7a3ffc174d56c80f8786ff
-Text-content-length: 222
+Text-content-length: 249
 Text-content-md5: fd1b691b409a21a510a7fc8820e6a2f6
 Text-content-sha1: 5e84be2aba06eae484a768aaead6daee7200d291
-Content-length: 222
+Content-length: 249

 Text-delta: true
 Text-delta-base-md5: aaa49b3db570ca4b32159a12b6e709ba
 Text-delta-base-sha1: 109c4b08e10c89d19fad502438e25a2bb741d355
-Text-content-length: 250
+Text-content-length: 360
 Text-content-md5: 09b80c313b0acfb236cddb3136809f55
 Text-content-sha1: 6a099150f1a77f737b31820da9e5430bb2db5bac
-Content-length: 250
+Content-length: 360

and so on. Is there any reason? Has a bug been introduced?
While I could except the opposite after an improvement of the
compression algorithm, a bigger dump is rather surprising.

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)