Add `JsonNode.canConvertToExactIntegral()` to indicate whether floating-point/BigDecimal values could be converted to integers losslessly

Is your feature request related to a problem? Please describe. DecimalNode might contain a valid integer or long, however DecimalNode.isIntegralNumber doesn’t cover such cases and return false from parent JsonNode.isIntegralNumber .

Describe the solution you’d like Implement DecimalNode.isIntegralNumber to return true if the value can fit into Long or Int

Usage example DecimalNode.isIntegralNumber(-1) == true

Additional context I want to use this check during json schema validation so that e.g. a DecimalNode containing an integer smaller than maximum long value can be considered as integer during type validation where schema has integer as type of the property

[cowtowncoder]

As per title, my current thinking is that method to add will be named

canConvertToExactIntegral()

and will next check that version. But can still consider even better naming until 2.12.0-rc2.

[cowtowncoder]

@oguzhanunlu Sure: I’ll change the title and mark this as potentially good first issue for someone to consider implementing; and it could go in a new minor version (2.12 if contribution came quickly enough; 2.13 otherwise).