make the SourceMap node validation more precise and possibly slightly more performant; related to #385#396

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GerHobbelt wants to merge 1 commit intomozilla:masterfrom GerHobbelt:patch-5

+64-28

Commits on Jun 18, 2019

make the SourceMap node validation more precise and possibly more performant: check for the okay/good cases before checking the various error situations. Hence the first error check (with its exten…
GerHobbelt
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