The decoded contents of a cursor minted by encodeCursor: the
values of every ordered field (in orderBy order) plus the primary-key
column values (for tiebreaker lookups) plus a stable fingerprint of the
sort specification. The fingerprint is what a fingerprint mismatch on decode
detects.
The i-th element of orderedValues is the value of
Object.entries(orderBy)[i] from the row the cursor was minted against.
This is what keysetPredicate indexes to build the "row after
this one" comparison — a cursor that carried only key-column values would
be wrong whenever orderBy contains non-key fields.
keyValues carries the same information but indexed by key
column name rather than by orderBy position. It is used by
keysetPredicate as the tiebreaker fallback when a key column is
absent from orderBy — using orderedValues[0] there would be wrong
because the first ordered-value may belong to a non-key field.
orderedValues: ReadonlyArray<CursorValue>
The value of every ordered field (in orderBy declaration order), from
the row the cursor was minted against. Index i is the value of the
i-th entry of Object.entries(orderBy).
keyValues: ReadonlyArray<CursorValue>
The primary-key column values (in key-column order), from the row the
cursor was minted against. Used by keysetPredicate as the
tiebreaker fallback when a key column is absent from orderBy.
A stable fingerprint of the resolved sort specification: each ordered field paired with its direction, in order. A cursor minted under one sort and presented under another has a different fingerprint, so the caller is refused by name rather than served a silently wrong page.