src/ios/CDVFile.m [896:906]:
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    CDVFilesystemURL* localURI = [self fileSystemURLforArg:command.arguments[0]];
    NSInteger start = [[command argumentAtIndex:1] integerValue];
    NSInteger end = [[command argumentAtIndex:2] integerValue];

    NSObject<CDVFileSystem> *fs = [self filesystemForURL:localURI];

    __weak CDVFile* weakSelf = self;
    [self.commandDelegate runInBackground:^ {
        [fs readFileAtURL:localURI start:start end:end callback:^(NSData* data, NSString* mimeType, CDVFileError errorCode) {
            CDVPluginResult* result = nil;
            if (data != nil) {
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src/ios/CDVFile.m [953:964]:
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    CDVFilesystemURL* localURI = [self fileSystemURLforArg:command.arguments[0]];
    NSInteger start = [[command argumentAtIndex:1] integerValue];
    NSInteger end = [[command argumentAtIndex:2] integerValue];

    NSObject<CDVFileSystem> *fs = [self filesystemForURL:localURI];

    __weak CDVFile* weakSelf = self;

    [self.commandDelegate runInBackground:^ {
        [fs readFileAtURL:localURI start:start end:end callback:^(NSData* data, NSString* mimeType, CDVFileError errorCode) {
            CDVPluginResult* result = nil;
            if (data != nil) {
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