Use identity-keyed maps

Canonical source: protos/examples/collections/identity-map.protos at locked revision e99b712ecf658a527b1fe82c8beba2c1286d8dc9.

This executable example is rendered from the exact Protos source consumed by the website. Its program body is copied without modification.

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first: { name: "same shape" }
second: { name: "same shape" }

byIdentity: IdentityMap()
byIdentity[first] = "first"
byIdentity[second] = "second"

print(byIdentity.size())
print(byIdentity[first])
print(byIdentity[second])

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