buffer.write empty string to end of buffer: regression?

[bryanburgers]

• Version: v6.4.0
• Platform: Linux 3.19.0-66-generic may be it's good idea go tell something about this fork? #74~14.04.1-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux
• Subsystem: Buffer

The following code did not throw an exception in v6.3.1 but does in v6.4.0:

'use strict';

const buf = Buffer.alloc(8);

// Write an empty string starting after the last byte of the buffer.
buf.write('', 8, 'utf8');

Reporting because it may be a regression that affects other people.

I'm not sure what should be expected or if this change needs to be documented somewhere. It probably makes complete sense that an exception is thrown, so I am not really questioning whether the way it works in v6.4.0 is correct or not.

[cannibal-kush]

This is a confirmed bug #8127

[targos]

Thanks for the report. Closing as duplicate of #8127
This bug will be fixed in the next release.