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Ordered Map

A map that remembers insertion order, demoing the p/moul/x/daily/orderedmap library.

Inserted

delta, alpha, charlie, bravo → order kept as inserted, not sorted:

# key value
1 delta 4
2 alpha 1
3 charlie 3
4 bravo 2

After Set("alpha", "99")

Updating keeps the original position — insertion order means first insertion:

# key value
1 delta 4
2 alpha 99
3 charlie 3
4 bravo 2

After deleting and re-adding charlie

Re-inserting is a new insertion, so it goes last:

# key value
1 delta 4
2 alpha 99
3 bravo 2
4 charlie new

gno map iteration order is unspecified. A realm that ranges over a built-in map to build its page can emit a different page every call — a consensus bug, not a cosmetic one. This is the fix.