(Improvements) Rune related and span-ish optimizations#1247

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pl752 wants to merge 17 commits intoFirebirdSQL:masterfrom

pl752:local_opt2

Commits on Dec 14, 2025

Changed float to int byte conversion to always use stackalloc
pl752
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Commits on Dec 20, 2025

Optimized rune methods for length edge cases and ascii-only strings
pl752
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Found out that float to int bytes conversion methods are already available in standard lirary
pl752
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Fixed length validation mishap for dec16
pl752
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