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Re:Google, Microsoft, Mozilla and Others Team Up to Launch W... by Touche on Thursday June 18, 2015 @12:23PM (#9739647)
Debugging will use SourceMaps which already exist today. As for efficiency, I haven't read anything that suggests WebAssembly will be more efficient than asm.js, why would it be?
Re:Google, Microsoft, Mozilla and Others Team Up to Launch W... by cicero on Thursday June 18, 2015 @02:19PM (#9740576)
Try reading this: https://brendaneich.com/2015/06/from-asm-js-to-webassembly/

"Why: asm.js is great, but once engines optimize for it, the parser becomes the hot spot — very hot on mobile devices. Transport compression is required and saves bandwidth, but decompression before parsing hurts."