uber / h3-go / 36616045688
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bench: replace the interface sink with a typed noinline sink in paritytest (#144)

The cross-implementation benchmarks kept results alive by assigning them to a
package-level `any`. That boxes every Cell, float64, LatLng and int64 result on
its way into the interface, which adds a small heap allocation and several
nanoseconds to every row and reports 1 alloc/op for functions that do not
allocate. On the smallest operations the box was a third or more of the
measured time, and it masked allocation changes in the library.

Replace the sink with a generic, noinline function. The result is materialized
and passed in its own type, so the call cannot be eliminated and nothing is
boxed. No benchmark body changes beyond the sink call.

benchstat, Go implementation, old harness vs new, five interleaved full-suite
rounds on an Apple M3 Max (five samples is below benchstat's threshold for a
confidence interval, so only the p-values are shown). Selected rows; the PR
carries the full tables for both implementations:

                                       old       new   vs base
NewLatLng-16                       11.250n    1.959n   -82.59% (p=0.008 n=5)
CellToLatLng-16                     86.39n    70.77n   -18.08% (p=0.008 n=5)
CellToString-16                     32.96n    20.18n   -38.77% (p=0.008 n=5)
CellMarshalText-16                  52.26n    19.79n   -62.13% (p=0.008 n=5)
CellFromString-16                   33.62n    26.05n   -22.52% (p=0.008 n=5)
Resolution-16                       2.058n    1.964n   -4.57% (p=0.008 n=5)
NumCells-16                         8.674n    1.978n   -77.20% (p=0.008 n=5)
Parent-16                          13.650n    5.874n   -56.97% (p=0.008 n=5)
ImmediateParent-16                 11.470n    3.919n   -65.83% (p=0.008 n=5)
CenterChild-16                      9.530n    2.226n   -76.64% (p=0.008 n=5)
ChildPosToCell-16                  15.850n    8.004n   -49.50% (p=0.008 n=5)
CellAreaRads2-16                    500.2n    488.8n   -... (continued)

4311 of 4311 relevant lines covered (100.0%)

2858015.84 hits per line

Jobs
ID Job ID Ran Files Coverage
1 Go- - 36616045688.1 19
100.0
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Source Files on build 36616045688