How does LR use Daylight/Tungsten settings in a camera profile?

Didn't see this in the very excellent DNG profile faq. If I make a profile that has different settings for daylight and tungsten, how exactly does LR decide when to use each? For instance, I would imagine that if I choose the Tungsten preset for WB, it would use the profile's Tungsten settings, but what if I just adjusted WB manually and set it to the same values as the Tungsten WB preset. Would LR still use the profile's Tungsten settings?
Or does it kind of combine/average them depending on whatever WB values you use?
Edit: Or if it's based on the setting you used in the camera, how would it handle an in-camera custom WB setting?
Anybody know?

Hi Will, correct, this information is not in the FAQ. Instead, the exact weighting method is given in the DNG specification. Here is the info (I copied and pasted from the spec):
DNG 1.2.0.0 and later requires a specific interpolation algorithm: linear interpolation using inverse correlated color temperature.
To find the interpolation weighting factor between the two tag sets, find the correlated color temperature for the user-selected white balance and the two calibration illuminants. If the white balance temperature is between two calibration illuminant temperatures, then invert all the temperatures and use linear interpolation. Otherwise, use the closest calibration tag set.

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