goja-core/src/main/java/goja/core/kits/stream/FastCharBuffer.java
public char[] toArray(int start, int len) {
        int remaining = len;
        int pos = 0;
        char[] array = new char[len];

        if (len == 0) {
            return array;
        }

        int i = 0;
        while (start >= buffers[i].length) {
            start -= buffers[i].length;
            i++;
        }

        while (i < buffersCount) {
            char[] buf = buffers[i];
            int c = Math.min(buf.length - start, remaining);
            System.arraycopy(buf, start, array, pos, c);
            pos += c;
            remaining -= c;
            if (remaining == 0) {
                break;
            }
            start = 0;
            i++;
        }
        return array;
    }
public char[] toArray(int start, int len) {
        int remaining = len;
        int pos = 0;
        char[] array = new char[len];

        if (len == 0) {
            return array;
        }

        int i = 0;
        while (start >= buffers[i].length) {
            start -= buffers[i].length;
            i++;
        }

        while (i < buffersCount) {
            char[] buf = buffers[i];
            int c = Math.min(buf.length - start, remaining);
            System.arraycopy(buf, start, array, pos, c);
            pos += c;
            remaining -= c;
            if (remaining == 0) {
                break;
            }
            start = 0;
            i++;
        }
        return array;
    }
Creates <code>char</code> subarray from buffered content.