[BUGFIX release] Add helpful error for {{each}} with duplicate keys. #11525
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This was referenced Jun 20, 2015
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Jun 21, 2015
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[BUGFIX release] Add helpful error for {{each}} with duplicate keys.
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This is a temporary "fix" for the issue, we generally believe that we can allow duplicate keys with a bit of work in HTMLBars, but this error will help folks know what to do to work around the problem until that fix can be implemented.
Fixes #11524.
Fixes #11504.
Fixes #11500.