Revamp the implementation of generate_series to simplify and improve

long-term maintainability.

FossilOrigin-Name: 9041ca8543ff3d2a617ce4df696aa53269a7803716caaf55a8e61e59ee667040

diff --cc manifest
index 981a5d54a44e316c1d5c5fbde1f4f4f3979491e4,b0dcfb9c5497018c18e7903ef8bdeffc0d19132f..c526ebe6085fd86cca1a437af65af2f471cf90e0
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Remove\sthe\slong-defunct\swasmfs\sbuild\sof\sspeedtest1\sfrom\sindex.html\sand\sre-enable\sthe\swasmfs\sscratchpad\sapp\s(which\sstill\sworks).\sFix\sthe\sCFLAGS\sfor\sthe\swasmfs\sbuild\sand\sthe\spath\sto\sthe\swasm\sfile\sfor\sone\sof\sthe\sJS.
- D 2025-09-28T18:03:29.667
 -C Minor\sbug\sfixes.\s\sMany\snew\stest\scases.
 -D 2025-09-28T17:24:42.767
++C Revamp\sthe\simplementation\sof\sgenerate_series\sto\ssimplify\sand\simprove\nlong-term\smaintainability.
++D 2025-09-28T18:25:59.467
  F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@@ -2169,8 -2169,8 +2169,9 @@@ F tool/version-info.c 3b36468a90faf1bbd
  F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee87c1b31a7
  F tool/warnings.sh 1ad0169b022b280bcaaf94a7fa231591be96b514230ab5c98fbf15cd7df842dd
  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
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+ U drh
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++Z e1db3f0aba6773a2fe5bbd6bf6414138
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index 49bda85fb9fceab9a040815598ddc6d9c149e91b,4badebcb57488c1422924236bd8d436a6269cc1a..953e4b0de830d9907e32abc6991f603700bd91da
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- acaaf8cce9e780bf937436b4c987ed284aa0bba6f5ca9508d9dbad598af2991d
 -86dcc68d1816d970d8d5fb158696c3fe6c5ddcac2c255823110d656372503885
++9041ca8543ff3d2a617ce4df696aa53269a7803716caaf55a8e61e59ee667040