JSTEP-2: Jackson 3 default settings, behavior changes

[cowtowncoder]

This is the placeholder issue for JSTEP that defines exact details of how Jackson 3.0 will change default settings for things like:

1. Databind Features (DeserializationFeature, SerializationFeature, MapperFeature)
2. General stream features (StreamReadFeature, StreamWriteFeature)
3. Format-specific features (JsonReadFeature, JsonWriteFeature)

except for changes covered under other concurrent JSTEPs (for example, exception inheritance hierarchy changes and JsonNode behavioral changes).

[cowtowncoder]

Copied from wiki (remove once we have separate page):

Done (by 25-Jan-2019):

• MapperFeature
  • SORT_PROPERTIES_ALPHABETICALLY: default to true (false really doesn't make much sense since it is unstable, and arbitrary based on JVM/JDK)

To Do (possibly):

• DeserializationFeature
  • READ_ENUMS_USING_TO_STRING: default to true (instead of false that relies on name())
  • FAIL_ON_UNKNOWN_PROPERTIES: default to false? (TOP REQUEST by users)
• SerializationFeature
  • FAIL_ON_EMPTY_BEANS: default to false
• Other
  • Date/time
    • Disable lenient setting (that is: default to "strict")
    • Check defaults of date/time handling

New features but changing behavior:

• DecimalNode creation via JsonNodeFactory: default to NOT truncating trailing zeroes (minimal trimming), because JsonNode should by default expose content as close to way it came.

[cowtowncoder]

Wiki page created, close placeholder.