Ensure _.isArray fallback returns a boolean value.

Former-commit-id: c96fb8e95c40d546099796f8337db6d4d3d33aea

dist/lodash.underscore.min.js

@@ -17,8 +17,8 @@ t=P(t,r),r=-1;var u=n?n.length:0;if(typeof u=="number")for(;++r<u&&!(e=t(n[r],r,
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