Revision history for Perl extension Freq.

0.01  Mon Apr 23 03:37:59 2001
	- original version; created by h2xs 1.20 with options
		-XA -n Freq
0.16  Tue Jan 25 19:04:25 PST 2005
	- Complete rewrite. Pure perl, with arbitrarily complex sequence and alternation queries, proximity searches, sentence-boundary indexing.

0.17  Thu Jan 27 16:04:25 PST 2005
	- Documentation corrections; added ABSTRACT; isr closure update; removed dependency on latest perl; added dependency on FileHandle;

0.19 Tue Feb  1 15:20:48 PST 2005
	- Added Inline'd sum_to_pos for both speed and memory savings.

0.20 Fri Feb  4 12:51:32 PST 2005 
	- fixed bug in next_integer_length causing infinite loop; changed to older module file layout to avoid conflict with Inline::MakeMaker. Annoyingly this produces a recompile on every make, even when just Perl code has changed

0.21 Mon Feb  7 19:05:32 PST 2005
	- bug in sum_to_pos made premature end to px; bug in isr_align_match closures gave false matches with inappropriate px

0.22 Thu Feb 10 13:49:41 PST 2005
	- changed DX underlying structure to ber-string instead of Perl array, added sum_to_doc inlined C function to process it. Gives huge memory savings and 2x search speedup; fixed bug in and-matcher logic

0.25 Tue Apr 26 11:42:56 PDT 2005
	- changed name to Seq.

0.26 
	- Replaced CDB disk hash backend with SQLite. Slower retrieval but has no size limit.

0.27 Fri May  6 12:58:02 PDT 2005
	- Replaced closure-based syntax tree with a merge-based, evaluated static tree, providing substantial speedup by eliminating subroutine calls.

0.29 Fri Jun  3 15:26:35 PDT 2005
	- (what happened to 0.28?) various optimizations. Changed query id from _N_ format to @N. Rewrote intermediate cache mechanism.