## Expected Behavior
When running dialyzer tool, there should be no warning for #shard record
construction.
## Current Behavior
The violation of shard record construction is reported in several files.
```
src/fabric_doc_open_revs.erl:0: in
fabric_doc_open_revs:check_finish_quorum/0[385-396]:Record construction
#shard{node::'node1',range::'undefined'} violates the declared type of field
range::'_' | ['$1' | '$2' | non_neg_integer()]
src/cpse_test_purge_replication.erl:0: in
cpse_test_purge_replication:make_shard/1[196-201]:Record construction
#shard{node::atom(),range::[0 | 4294967295,...],opts::'undefined'} violates the
declared type of field opts::[any()]
```
## Steps to Reproduce (for bugs)
Run dialyzer tool and make sure there are no complains about
`couch_key_tree:merge`
1. Prepare for analysis:
```
make build-plt
```
2. Run analysis
```
make dialyze
## Context
<!--- How has this issue affected you? What are you trying to accomplish? -->
<!--- Providing context helps us come up with a solution that is most useful in
the real world -->
## Your Environment
<!--- Include as many relevant details about the environment you experienced
the bug in -->
```
Darwin localhost 17.3.0 Darwin Kernel Version 17.3.0: Thu Nov 9 18:09:22 PST
2017; root:xnu-4570.31.3~1/RELEASE_X86_64 x86_64
```
[ Full content available at: https://github.com/apache/couchdb/issues/1580 ]
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