Merge branch 'master' into keytype-abstractarray

NEWS.md

@@ -55,6 +55,9 @@ Standard library changes
 * `mktempdir` now accepts a `prefix` keyword argument to customize the file name ([#31230], [#22922])
 * `keytype` and `valtype` now work on `AbstractArray`, and return the `eltype` of `keys(...)` and
   `values(...)` respectively ([#27749]).
+* `nextfloat(::BigFloat)` and `prevfloat(::BigFloat)` now returns a value with the same precision
+  as their argument, which means that (in particular) `nextfloat(prevfloat(x)) == x` whereas
+  previously this could result in a completely different value with a different precision ([#31310])
 
 #### LinearAlgebra