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Changes between Initial Version and Version 1 of Ticket #11096, comment 3

initial	v1
15	15
16	16	At the lowest level we have the //expression// parser with escape `\` and quote `'`.
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	18	One thing we have been able to isolate during a short discussion on IRC is that, in the current implementation, the parser for the filter complex does not recognize the `'` quotes; they are interpreted by "something else". And only by some other mechanic, such quotes will //do// prevent interpretation of `,` in cases such as `overlay=x='lerp(1,2,0.5)'`, where otherwise they'd end the filter. So this looks like perhaps the first design issue to adress.