If I run the following code in 3.6.2, the spheres appear red and blue,
respectively, for +q5 and lower; and they both appear yellow for +q6 and higher.
 This is expected according to the documentation.

However, in 3.7, both spheres appear yellow regardless of the quality settings.
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#include "colors.inc"

global_settings { assumed_gamma 1 }

camera
{  location -4 * z
   look_at 0
}

light_source { <-2, 3, -1> * 1000, 1 }

sphere
{  -x, 1
   pigment { color Yellow quick_color Red }
}
sphere
{  x, 1
   pigment { color Yellow quick_color Blue }
}

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