Uglifyjs breaks code on when sequences option on

[sherlock1982]

Bug

Uglify version 3.4.9

JavaScript input

var input1 = Array.from([17, 240, 159, 152, 128, 32]);

function utf8_read(buffer, start, end) {
    var len = end - start;
    if (len < 1)
        return "";
    var parts = null,
        chunk = [],
        i = 0, // char offset
        t;     // temporary
    while (start < end) {
        t = buffer[start++];
        if (t < 128)
            chunk[i++] = t;
        else if (t > 191 && t < 224)
            chunk[i++] = (t & 31) << 6 | buffer[start++] & 63;
        else if (t > 239 && t < 365) {
            t = ((t & 7) << 18 | (buffer[start++] & 63) << 12 | (buffer[start++] & 63) << 6 | buffer[start++] & 63) - 0x10000;
            chunk[i++] = 0xD800 + (t >> 10);
            chunk[i++] = 0xDC00 + (t & 1023);
        } else
            chunk[i++] = (t & 15) << 12 | (buffer[start++] & 63) << 6 | buffer[start++] & 63;
        if (i > 8191) {
            (parts || (parts = [])).push(String.fromCharCode.apply(String, chunk));
            i = 0;
        }
    }
    if (parts) {
        if (i)
            parts.push(String.fromCharCode.apply(String, chunk.slice(0, i)));
        return parts.join("");
    }
    console.log(chunk);
    return String.fromCharCode.apply(String, chunk.slice(0, i));
};

utf8_read(input1, 0, input1.length);

CLI command executed

 node index.js && node_modules\.bin\uglifyjs index.js -c sequences > index.min.js && node index.min.js

This works:

  node index.js && node_modules\.bin\uglifyjs index.js -c sequences=false > index.min.js && node index.min.js

JavaScript output or error produced.

Actual output (of minified file):

[ 17, 56832, 55357, 32 ]

Expected output (of original file):

[ 17, 55357, 56832, 32 ]

[kzc]

Dup of #3245 #3257 #3260 #3269 #3271 #3278

Either lock in uglify-js@3.4.8 or disable the compress option conditionals.

[nylen]

Releasing a new version and then disappearing is bad form. Please follow up with your community after the release.

If you don't have time to do that, better not to do the release in the first place.