YAML DUMP_MULTI_LINE_LITERAL_BLOCK question, possible bug

In outputting an array to YAML, my multi-line strings were not being output as literals, but I found that if I changed the line in Dumper.php from

if ($inline > 1 && Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK
    & $flags && is_string($value) && false !== strpos($value, "\n")) {

to

if ($inline >= 1 && Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK
    & $flags && is_string($value) && false !== strpos($value, "\n")) {

then it works perfectly.

Is there a reason for checking for $inline > 1?

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