JsonNodeEquivalence: fix implementation of numeric node hashcodes

The implementation was unfortunately flawed for sufficiently large integers with
decimal zeroes.

Use Double instead, since there is a guarantee that for BigDecimal, two
mathematically equivalent values will yield the same double value.

Signed-off-by: Francis Galiegue <fgaliegue@gmail.com>
1.4.5

* Fix numeric equivalence in JsonNodeEquivalence: it would fail for large
  integers with decimal values.

Francis Galiegue (1):
      JsonNodeEquivalence: fix implementation of numeric node hashcodes

Signed-off-by: Francis Galiegue <fgaliegue@gmail.com>