Generic dictionary indexer behaves differently

Today I discovered, the hard way, that if you ask for a key value that doesn’t exist in a generic dictionary you get an exception, whereas for specialised dictionaries (or your own derived ones) you get null. This was especially annoying has I have a load of code expecting null and a colleague changed the dictionary to a generic one. So I had to change the indexer to do a quick "contains key" to return null if the key doesn’t exist.
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