New is* snippets need to convert to boolean

[atomiks]

Current:

const isArray = val => val && Array.isArray(val);
// isArray(null) -> null (not false)

Use:

const isArray = val => !!val && Array.isArray(val);
// isArray(null) -> false

[Chalarangelo]

PR it! I wrote them quite hastily!

[lock]

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