[xml] Extremely small doubt in libxml2

[Akash Opensource <akash opensource gmail com>]

Hi Veillard and Support Team,

Thanks for the wonderful code of libxml2 written by you and the team.

It's a boon to software developers and teachers.

I have a doubt regarding xmlParserInputBufferGrow() function in libxml2.

I checked all the latest version of libxml2, but I don't see a explanation to a line len != 4.

Also I searched everywhere that value never goes to 4.

Can you please help me in providing any info related to this, why it is 4 ?

Thanks & Regards,

_OpenSourceGuy

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