Several issues with flatten_preserve_lists

[imbalu007]

I found the following issues with flatten_preserve_lists

1. flatten_preserve_lists({'K': ['abc', [1, 2, 3]]}, separator="+") results in the error re.error: nothing to repeat at position 1

2. flatten_preserve_lists({'K': ['abc', [1, 2, 3]]}, separator="=+") (note that the 'separator' is '=+' and not '+' as in the previous case)

• output: [{'K=+0=+1=+0=+1=+2': None, 'K=+0=+1=+0=+1': None, 'K=+0=+1=+0': None, 'K=+0': None, 'K': 'abc'}, {'K=+0=+1=+0=+1=+2': None, 'K=+0=+1=+0=+1': None, 'K=+0=+1=+0': None, 'K=+0': None, 'K': 1}, {'K=+0=+1=+0=+1=+2': None, 'K=+0=+1=+0=+1': None, 'K=+0=+1=+0': None, 'K=+0': None, 'K': 2}, {'K=+0=+1=+0=+1=+2': None, 'K=+0=+1=+0=+1': None, 'K=+0=+1=+0': None, 'K=+0': None, 'K': 3}]
• expected: {'K': ['abc', [1, 2, 3]]} as the input is not nested

3. flatten_preserve_lists({'K': ['abc', [[1, 2, 3]]]}, separator="=+")

• output: [{'K=+0=+1=+0=+0=+1': None, 'K=+0=+1=+0=+0=+1=+2': None, 'K=+0=+1=+0=+0': None, 'K=+0': None, 'K': 'abc'}, {'K=+0=+1=+0=+0=+1': None, 'K=+0=+1=+0=+0=+1=+2': None, 'K=+0=+1=+0=+0': None, 'K=+0': None, 'K': [1, 2, 3]}]
• expected: {'K': ['abc', [[1, 2, 3]]]} as the input is not nested

4. flatten_preserve_lists({'K': ['abc', [1, 2, 3]]})

• output: [{'K': 'abc'}, {'K': 1}, {'K': 2}, {'K': 3}]
• expected: {'K': ['abc', [1, 2, 3]]} as the input is not nested

5. flatten_preserve_lists({'K': ['abc', [[1, 2, 3]]]})

• output: [{'K': 'abc'}, {'K': [1, 2, 3]}]
• expected: {'K': ['abc', [1, 2, 3]]} as the input is not nested

I am working with the latest version of flatten_json, which is currently 0.1.13