[Tutor] Good reasons for 1.5.2 compatibility?

[John Abbe]

I've started a project that i intend to make available to the public, 
and have been keeping it 1.5.2-compatible. Is this worth the bother? 
That is, do many ISPs still have 1.5.2 running? (mine did until i 
asked for an upgrade) Are there any factors causing reasonable people 
to keep 1.5.2 around?

Life,
John
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