In all three files (three.js, three.module.js, and the InterleavedBufferAttribute source file), there is a typo when wishing to clone the InterleavedBufferAttribute without putting in a data source. In all three places, there is this line
console.log( 'THREE.InterleavedBufferAttribute.clone(): Cloning an interlaved buffer attribute will deinterleave buffer data.' );
It says “Cloning an interlaved buffer attribute” instead of “Cloning an interleaved buffer attribute” in all three files. This is by no means a massive issue. I just happened to notice it when looking through the three.js source and thought that it should be brought up to a person that can change it.
Edit:
The same typo also appears in the toJSON method