Repository navigation
ISpanFormattable / TryFormat for ranges, range sets and value sets #41
Description
Implement ISpanFormattable (TryFormat) on the range unions, RangeSet and the value sets, so formatting into a span or an interpolated string handler doesn't allocate an intermediate string.
The output must be the same as ToString byte for byte, and the same provider rule applies: without a format string the result is the invariant literal, whatever the provider. LiteralProviderContractTests and LiteralCultureContractTests should sweep TryFormat as well.
Activity
CaffeinatedCoder commentedon Oct 17, 2026
Moved off 9.1.0 into the backlog (#83), with no milestone.
release/9.xhas been cut, and 9.1.0 ships with the work that's already finished. Nothing has started on this issue, and it shouldn't hold up the tag. This is an addition, so the 10.0.0 epic (#58) doesn't take it either: that epic is kept to thesilentandbreakingfixes so they aren't held up behind new features.When someone picks it up, it goes under the epic of the release it will ship in and takes that milestone. A 9.x minor would need the change cherry-picked onto
release/9.x.CaffeinatedCoder commentedon Oct 17, 2026
From the comparable-library survey (2026-10-17): add
IUtf8SpanFormattableandIUtf8SpanParsable<TSelf>to the scope. The literal is ASCII except for element text, so a UTF-8TryFormat/TryParsepair letsUtf8JsonWriter.WriteStringValue(ReadOnlySpan<byte>)and the EFJsonValueReaderWriterpaths skip the string. Same contract: byte-for-byte the invariant literal, provider ignored without a format string, swept byLiteralProviderContractTestsandLiteralCultureContractTests.