Enhance text→float conversions for exact rounding in all cases.

FossilOrigin-Name: 704ddfd0df57c2b137af88264df20a540e3f8f114a58ae5e31b40ab8259bb63e

diff --cc manifest
index cbeab1a0b1d43a3b00e588af7593e6864232d3f9,142aa253b982fcf006d420788fb78be5f90c7c6d..b1062ba106745d53846d817dc08f6e224b7b9c38
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Rework\sthe\s".indexes"\scommand\sof\sthe\sCLI.\s\s(1)\sThe\sPATTERN\snow\smatches\nthe\sname\sof\sthe\sindex\sitself,\snot\sthe\sname\sof\sthe\stable\scontaining\nthe\sindex,\sthus\smaking\sthe\spattern\sactually\suseful.\s\s(2)\s\sSystem-generated\nindexes\s(for\sUNIQUE\sconstraints\sand\ssimilar)\sare\somitted\sunless\nthe\s-a|-all\sor\s--sys\soptions\sare\sadded.\s\s(3)\sThe\s--expr\soption\scauses\nonly\sexpression\sindexes\sto\sbe\sshown.
- D 2026-03-16T15:35:41.736
 -C Include\sthe\sfloat-point\stable\sgenerator\sutility\sin\sthe\stools\sdirectory.
 -D 2026-03-17T09:45:47.412
++C Enhance\stext→float\sconversions\sfor\sexact\srounding\sin\sall\scases.
++D 2026-03-17T09:49:07.391
  F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@@ -2192,8 -2193,8 +2193,9 @@@ F tool/warnings-clang.sh bbf6a1e685e534
  F tool/warnings.sh d924598cf2f55a4ecbc2aeb055c10bd5f48114793e7ba25f9585435da29e7e98
  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
  F tool/winmain.c 00c8fb88e365c9017db14c73d3c78af62194d9644feaf60e220ab0f411f3604c
- P 80bc5bc07e221f837c28066f0a438f11c8ab6be4c8ba93615439eb1667967003
- R 3ad37f8e404f71b8ecba081b76070ad6
 -P 23ad656edb3a63e7e6602770e1f2c4a5ef1f3d41565e7f13408b5305619dfa3d
 -R 0212d90b78d20068a702d7e70e4b68de
++P 13e2cad810bfd59a9e18eb38bda1241715b76756ffec7d617e9ce99b89f19284 4ab10b251d870af8297b9e505452393f6000f83784c822ff128e7aec06f8c72f
++R db8308d0c3df23a204d08754ac698c9d
++T +closed 4ab10b251d870af8297b9e505452393f6000f83784c822ff128e7aec06f8c72f
  U drh
- Z d82e0cbe9c28448c805d23a2e1afab0e
 -Z a52753c1b6f0991d0a121a4d3cb8bc3e
++Z e98267478d6bb8562b872b8867d13830
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index e063f116471cdf2c89099effdf3c400aedbd2dfa,9d1ef375b7940e290314f1e59647edf7e2507802..53daf2b8d452a75add131fdd1df64efe44424bc8
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 13e2cad810bfd59a9e18eb38bda1241715b76756ffec7d617e9ce99b89f19284
 -4ab10b251d870af8297b9e505452393f6000f83784c822ff128e7aec06f8c72f
++704ddfd0df57c2b137af88264df20a540e3f8f114a58ae5e31b40ab8259bb63e