Results do not match other implementations

[cburgmer]

The following queries provide results that do not match those of other implementations of JSONPath
(compare https://cburgmer.github.io/json-path-comparison/):

• $.2
  Input:

  {"a": "first", "2": "second", "b": "third"}
  

  Expected output:

  ["second"]
  

  Error:

  parsing error: $.2	:1:2 - 1:4 unexpected Float while scanning operator
  

• $[-1]
  Input:

  ["first", "second", "third"]
  

  Expected output:

  ["third"]
  

  Error:

  index -1 out of bounds
  

• $[?(@.key=='value')]
  Input:

  [{"key": "some"}, {"key": "value"}]
  

  Expected output:

  [{"key": "value"}]
  

  Error:

  parsing error: $[?(@.key=='value')]	:1:12 - 1:19 could not parse string: invalid syntax
  

• $[?(@.key)]
  Input:

  [{"some": "some value"}, {"key": "value"}]
  

  Expected output:

  [{"key": "value"}]
  

  Actual output:

  []
  

• $['key']
  Input:

  {"key": "value"}
  

  Expected output:

  ["value"]
  

  Error:

  parsing error: $['key']	:1:3 - 1:8 could not parse string: invalid syntax
  

• $['one','three'].key
  Input:

  {"one": {"key": "value"}, "two": {"k": "v"}, "three": {"some": "more", "key": "other value"}}
  

  Expected output:

  ["value", "other value"]
  

  Error:

  parsing error: $['one','three'].key	:1:3 - 1:8 could not parse string: invalid syntax
  

• $['two.some']
  Input:

  {"one": {"key": "value"}, "two": {"some": "more", "key": "other value"}, "two.some": "42"}
  

  Expected output:

  ["42"]
  

  Error:

  parsing error: $['two.some']	:1:3 - 1:13 could not parse string: invalid syntax
  

• $['special:"chars']
  Input:

  {"special:\"chars": "value"}
  

  Expected output:

  ["value"]
  

  Error:

  parsing error: $['special:"chars']	:1:3 - 1:19 could not parse string: invalid syntax
  

For reference, the output was generated by the program in https://github.com/cburgmer/json-path-comparison/tree/master/implementations/Golang_github.com-PaesslerAG-jsonpath.