Add quotes for all values listed in https://yaml.org/type/bool.html - Backport #137 for 2.9#138

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GuillaumeSmaha wants to merge 1 commit intoFasterXML:2.9from GuillaumeSmaha:backport_protect_value_to_avoid_implict_convertion

+69-5

Commits on Jun 28, 2019

Add quotes for all values listed in https://yaml.org/type/bool.html
GuillaumeSmaha
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