Change:
}; coreOffset = mkOption { <del> type = types.nullOr types.str; </del> <ins> type = types.nullOr types.int; </ins> default = null; description = '' <del> The amount of voltage to offset the CPU cores by. Accepts a floating point number. </del> <ins> The amount of voltage in mV to offset the CPU cores by. </ins> ''; }; gpuOffset = mkOption { <del> type = types.nullOr types.str; </del> <ins> type = types.nullOr types.int; </ins> default = null; description = '' <del> The amount of voltage to offset the GPU by. Accepts a floating point number. </del> <ins> The amount of voltage in mV to offset the GPU by. </ins> ''; }; uncoreOffset = mkOption { <del> type = types.nullOr types.str; </del> <ins> type = types.nullOr types.int; </ins> default = null; description = '' <del> The amount of voltage to offset uncore by. Accepts a floating point number. </del> <ins> The amount of voltage in mV to offset uncore by. </ins> ''; }; analogioOffset = mkOption { <del> type = types.nullOr types.str; </del> <ins> type = types.nullOr types.int; </ins> default = null; description = '' <del> The amount of voltage to offset analogio by. Accepts a floating point number. </del> <ins> The amount of voltage in mV to offset analogio by. </ins> ''; }; temp = mkOption { <del> type = types.nullOr types.str; </del> <ins> type = types.nullOr types.int; </ins> default = null; description = '' <del> The temperature target. Accepts a floating point number. </del> <ins> The temperature target in Celsius degrees. </ins> ''; }; tempAc = mkOption { <del> type = types.nullOr types.str; </del> <ins> type = types.nullOr types.int; </ins> default = null; description = '' <del> The temperature target on AC power. Accepts a floating point number. </del> <ins> The temperature target on AC power in Celsius degrees. </ins> ''; }; tempBat = mkOption { <del> type = types.nullOr types.str; </del> <ins> type = types.nullOr types.int; </ins> default = null; description = '' <del> The temperature target on battery power. Accepts a floating point number. </del> <ins> The temperature target on battery power in Celsius degrees. </ins> ''; }; };

Discussion:
Describe the bug The undervolt module is potentially damaging to hardware when misconfigured. The module description needs an appropriate warning informing users that they are taking a risk when enabling it (even though I think it's fairly obvious that's the case). Maintainer information: cc
It would also be nice if the options' description specified what units are expected for the "amount of voltage". And I don't know how feasible it is but if the options accept a floating point number as per their documenation they should perhaps be of a numeric type as well.
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Still relevant.