[issue13903] New shared-keys dictionary implementation

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

The latest patch has a significant (negative) effect on some benchmarks:

### silent_logging ###
Min: 0.057927 -> 0.068228: 1.18x slower
Avg: 0.058218 -> 0.068660: 1.18x slower
Significant (t=-36.06)

### mako ###
Min: 0.118240 -> 0.140451: 1.19x slower
Avg: 0.120145 -> 0.142422: 1.19x slower
Significant (t=-61.66)

These regressions should be fixed before going any further, IMO.

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<http://bugs.python.org/issue13903>
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