nl_tokens: Tests equality of two ArrayBuffer
pl_tokens: function equals ( buf1 , buf2 ) { if ( buf1 . byteLength != buf2 . byteLength ) return false ; const dv1 = new Int8Array ( buf1 ) ; const dv2 = <mask> Int8Array ( buf2 ) ; for ( let i = 0 ; i != buf1 . byteLength ; i ++ ) { if ( dv1 [ i ] != dv2 [ i ] ) return false ; } return true ; }