src/Composer/Repository/ComposerRepository.php
public function findPackage($name, $constraint)
    {
        if (!$this->hasProviders()) {
            return parent::findPackage($name, $constraint);
        }

        $name = strtolower($name);
        if (!$constraint instanceof ConstraintInterface) {
            $versionParser = new VersionParser();
            $constraint = $versionParser->parseConstraints($constraint);
        }

        foreach ($this->getProviderNames() as $providerName) {
            if ($name === $providerName) {
                $packages = $this->whatProvides(new Pool('dev'), $providerName);
                foreach ($packages as $package) {
                    if ($name === $package->getName()) {
                        $pkgConstraint = new Constraint('==', $package->getVersion());
                        if ($constraint->matches($pkgConstraint)) {
                            return $package;
                        }
                    }
                }
                break;
            }
        }
    }
public function findPackage($name, $constraint)
    {
        if (!$this->hasProviders()) {
            return parent::findPackage($name, $constraint);
        }

        $name = strtolower($name);
        if (!$constraint instanceof ConstraintInterface) {
            $versionParser = new VersionParser();
            $constraint = $versionParser->parseConstraints($constraint);
        }

        foreach ($this->getProviderNames() as $providerName) {
            if ($name === $providerName) {
                $packages = $this->whatProvides(new Pool('dev'), $providerName);
                foreach ($packages as $package) {
                    if ($name === $package->getName()) {
                        $pkgConstraint = new Constraint('==', $package->getVersion());
                        if ($constraint->matches($pkgConstraint)) {
                            return $package;
                        }
                    }
                }
                break;
            }
        }
    }
{@inheritDoc}