Pronunciation of l before k

[Srini Pichumani]

Madhav Deshpande wrote:

> The contextual (allophonic) pronunciations of Sanskrit sounds are not
> studied by Sanskrit grammarians and phoneticians, except perhaps in the
> context of what is called faults of pronunciation (uccaara.nado.sa), cf.
> chapters in texts like the .Rk-Praatizaakhya and Mahaabhaa.sya.

Does the usual pronunciation of braahma.na (as braamha.na or just braamma.na)
fall into this category of uccaara.nado.sa ?  Is there early notice of this ?

-Srini.