number followed by a newline doesn't roundtrip

[blearyeyed]

Test case for t/tml-local/yaml-roundtrip/quoting.tml:

=== Number followed by a newline
--- yaml

---
foo: "0\n"
--- perl
[ { foo => "0\n" } ]

Output:

        #   Failed test 'YAML::Tiny round-trips without error'
        #   at t/lib//TestBridge.pm line 161.
        #          got: 'YAML::Tiny does not support a feature in line ''0' at t/lib//TestBridge.pm line 160.
        # '
        #     expected: ''