salsa-v0.28.0

Added

• replace Update with SalsaValue and PartialEq (#1217)
• return references by default (#1216)
• report per-ingredient page occupancy (#1181)

Fixed

• restore compact interned value layout (#1244)
• implement SalsaValue for FxBuildHasher (#1241)
• restart fixpoint iteration after cancellation (#1238)
• replace tracked method db-arg index panic with proper compile error (#1228)

Other

• reduce memo validation monomorphization (#1206)
• reduce interned constructor monomorphization (#1208)
• avoid hashing query edge generations (#1223)
• erase configuration from interned storage (#1204)
• reduce table page size (#1179)
• Add untracked field read benchmark (#1225)
• Revise salsa benchmarks (#1224)
• update Salsa book for current APIs (#1215)
• document proc macros and Salsa concepts (#1213)
• simplify specify origin handling (#1214)
• reduce table monomorphization (#1211)
• reduce ingredient cache monomorphization (#1207)
• inline tracked struct revision loads (#1202)
• avoid repeated cycle dependency lookups (#1201)