Bug: FluidMLPRegressor's .fit method evaluating 'action' before finishing

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Trying to .dump a DataSet as an action function FluidMLPRegressor's .fit method consistently throws an error:

// create some resources
(
~makeDict = { Dictionary.newFrom(["cols",1,"data",Dictionary.newFrom(200.collect({ |i| [i, [1.0.rand]] }).flatten(1) ) ]) };
~inDS = FluidDataSet(s).load( ~makeDict.value );
~outDS = FluidDataSet(s).load( ~makeDict.value );
~mlp = FluidMLPRegressor(s);
)

// run this:
(
fork{
    2.do{
        ~mlp.fit(~inDS,~outDS,{
            ~outDS.dump({ |d| d["data"]["0"].dopostln })
        });
        0.01.wait;
    }
}
)

What was the expected result?

The help file describes the action argument as "A function to execute when the server has completed running fit," though it seems it's being executed sooner than that. I ran similar tests on a few other FluidDataObjects and their methods (though not exhaustively) and experienced the same errors.

What was the actual result?

It seems like .dump is trying to access a File that isn't finished writing yet, implying that .dump is being called before .fit has finished.

ERROR: Primitive '_FileLength' failed.
Failed.
RECEIVER:
Instance of File {    (0x1409cfa88, gc=E0, fmt=00, flg=00, set=02)
  instance variables [1]
    fileptr : nil
}

PROTECTED CALL STACK:
    Meta_MethodError:new    0x150922880
        arg this = PrimitiveFailedError
        arg what = Failed.
        arg receiver = a File
    Meta_PrimitiveFailedError:new   0x15092a740
        arg this = PrimitiveFailedError
        arg receiver = a File
    Object:primitiveFailed  0x1602991c0
        arg this = a File
    File:readAllString  0x151c16740
        arg this = a File
        var string = nil
    a FunctionDef   0x151c0f680
        sourceCode = "<an open Function>"
        arg file = a File
    Function:prTry  0x150d53c00
        arg this = a Function
        var result = nil
        var thread = a Thread
        var next = nil
        var wasInProtectedFunc = false

CALL STACK:
    MethodError:reportError
        arg this = <instance of PrimitiveFailedError>
    Nil:handleError
        arg this = nil
        arg error = <instance of PrimitiveFailedError>
    Thread:handleError
        arg this = <instance of Thread>
        arg error = <instance of PrimitiveFailedError>
    Object:throw
        arg this = <instance of PrimitiveFailedError>
    Function:protect
        arg this = <instance of Function>
        arg handler = <instance of Function>
        var result = <instance of PrimitiveFailedError>
    Meta_File:readAllString
        arg this = <instance of Meta_File>
        arg pathName = "/Users/mikemccormick/Library..."
        var string = nil
    < FunctionDef in Method FluidDataObject:dump >  (no arguments or variables)
    OSCFuncAddrMessageMatcher:value
        arg this = <instance of OSCFuncAddrMessageMatcher>
        arg msg = [*2]
        arg time = 2063.391093209
        arg testAddr = <instance of NetAddr>
        arg recvPort = 57120
    Dictionary:keysValuesArrayDo
        arg this = <instance of IdentityDictionary>
        arg argArray = [*32]
        arg function = <instance of Function>
        var i = 20
        var j = 1
        var key = nil
        var val = nil
        var arraySize = nil
    Dictionary:keysValuesDo
        arg this = <instance of IdentityDictionary>
        arg function = <instance of Function>
    FluidOSCPatternInversion:value
        arg this = <instance of FluidOSCPatternInversion>
        arg msg = [*2]
        arg time = 2063.391093209
        arg addr = <instance of NetAddr>
        arg recvPort = 57120
        var msgpath = '/FluidDataSet/write'
    < FunctionDef in Method Collection:collectInPlace >
        arg item = <instance of FluidOSCPatternInversion>
        arg i = 2
    ArrayedCollection:do
        arg this = [*5]
        arg function = <instance of Function>
        var i = 2
    Collection:collectInPlace
        arg this = [*5]
        arg function = <instance of Function>
    FunctionList:value
        arg this = <instance of FunctionList>
        arg args = [*4]
        var res = nil
    Main:recvOSCmessage
        arg this = <instance of Main>
        arg time = 2063.391093209
        arg replyAddr = <instance of NetAddr>
        arg recvPort = 57120
        arg msg = [*2]
^^ The preceding error dump is for ERROR: Primitive '_FileLength' failed.
Failed.
RECEIVER: a File

What operating system were you using?

Mac

Operating system version

macOS 13.5

FluCoMa Version

1.0.6

flucoma / flucoma-sc