Large payloads aren't transfered properly

[nesk]

As stated in rialto-php/puphpeteer#2, there are some issues if the payload transfered from Node to PHP is too large. It seems to happen when the payload exceeds ~10000 bytes. A first part of it is received by PHP, and the second part is received on the next socket read, which messes everything.

[nesk]

Fixed with b66241a. The issue was not only about payload length, it occured when the payload exceeded the socket packet size and contained non-ASCII characters.